Lincoln Nautilus: Rear Seats / Rear Seats. Diagnosis and Testing
Symptom Chart(s)
Symptom Chart: Rear Seats
Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
Symptom Chart
Condition
|
Possible Sources
|
Actions
|
Both heated rear seats are inoperative
|
-
Refer to the Pinpoint Test
|
|
The LH heated rear seat is inoperative
|
-
Refer to the Pinpoint Test
|
|
The RH heated rear seat is inoperative
|
-
Refer to the Pinpoint Test
|
|
The LH heated rear seat heats correctly but the indicator does not illuminate when activated
|
-
Refer to the Pinpoint Test
|
|
The RH heated rear seat heats correctly but the indicator does not illuminate when activated
|
-
Refer to the Pinpoint Test
|
|
The LH heated rear seat indicator is always on
|
-
Wiring, terminals or connectors
-
Heated seat module
|
-
DISCONNECT the heated rear seat module electrical connector.
-
If the LH heated rear seat indicator turns off when the heated rear
seat module is disconnected, INSTALL a new heated rear seat module.
REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).
-
If the LH heated rear seat indicator remains on when the heated rear
seat module is disconnected, REPAIR the LH heated rear seat module
indicator circuits for a short to voltage.
|
The RH heated rear seat indicator is always on
|
-
Wiring, terminals or connectors
-
Heated seat module
|
-
DISCONNECT the heated rear seat module electrical connector.
-
If the RH heated rear seat indicator turns off when the heated rear
seat module is disconnected, INSTALL a new heated rear seat module.
REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).
-
If the RH heated rear seat indicator remains on when the heated rear
seat module is disconnected, REPAIR the RH heated rear seat module
indicator circuits for a short to voltage.
|
Both rear power fold seats are inoperative
|
-
Refer to the Pinpoint Test
|
|
The LH rear power fold seat is inoperative
|
-
Refer to the Pinpoint Test
|
|
The RH rear power fold seat is inoperative
|
-
Refer to the Pinpoint Test
|
|
Pinpoint Tests
Both Heated Rear Seats are Inoperative
Refer to Wiring Diagrams Cell 119 for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Rear Seats (501-10 Rear Seats)
.
Possible Causes
-
Fuse
-
Wiring, terminals or connectors
-
Heated seat module
Visual Inspection and Diagnostic Pre-checks
-
Verify BCM fuse 36 (15A) is OK.
-
Verify BJB fuse 73 (20A) is OK.
PINPOINT TEST A: BOTH HEATED REAR SEATS ARE INOPERATIVE
A1 CHECK FOR VOLTAGE TO THE HEATED REAR SEAT MODULE |
-
Disconnect Heated Rear Seat Module C3304B
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304B-1
|
|
Ground
|
C3304B-2
|
|
Ground
|
Are the voltages greater than 11 volts?
No |
VERIFY BJB fuse 73 (20A) and BCM
fuse 36 (15A) are OK. If OK, REPAIR the circuit in question. If not
OK, REFER to the Wiring Diagrams manual to identify the possible causes
of the circuit short.
|
|
A2 CHECK THE HEATED REAR SEAT MODULE GROUND CIRCUIT FOR AN OPEN |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304B-5
|
|
Ground
|
Is the resistance less than 3 ohms?
|
A3 VERIFY THE HEATED REAR SEAT SWITCH IS PROVIDING A GROUND INPUT SIGNAL TO THE HEATED SEAT MODULE |
-
Disconnect Heated Rear Seat Module C3304A
.
-
While pressing and releasing the LH heated rear seat switch, measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-2
|
|
Ground
|
Is the resistance less than 3 ohms when the switch is pressed and greater than 10,000 ohms when released?
|
A4 CHECK THE HEATED REAR SEAT SWITCH GROUND CIRCUIT FOR AN OPEN |
-
Disconnect Heated Rear Seat Switch C3182
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3182-8
|
|
Ground
|
Is the resistance less than 3 ohms?
Yes |
INSTALL a new heated rear seat switch. REFER to: Heated Rear Seat Switch (501-10B Rear Seats, Removal and Installation).
|
|
A5 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR SHORT TO VOLTAGE |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-3
|
|
Ground
|
Is any voltage present?
|
A6 CHECK THE TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-3
|
|
C3304A-12
|
Is the resistance between 300 and 300K ohms?
Yes |
INSTALL a new heated rear seat module. REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).
|
|
The LH Heated Rear Seat is Inoperative
Refer to Wiring Diagrams Cell 119 for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Rear Seats (501-10 Rear Seats)
.
Possible Causes
-
Wiring, terminals or connectors
-
Heater mat
-
Heated seat switch
-
Heated seat module
PINPOINT TEST B: THE LH (LEFT-HAND)
HEATED REAR SEAT IS INOPERATIVE
B1 CHECK THE HEATED SEAT SWITCH INPUT |
-
Disconnect Heated Rear Seat Module C3304A
.
-
While pressing and releasing the LH heated rear seat switch, measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-2
|
|
Ground
|
Is the resistance less than 3 ohms when the switch is pressed and greater than 10,000 ohms when released?
|
B2 CHECK THE HEATED SEAT SWITCH CIRCUIT FOR AN OPEN OR SHORT TO GROUND |
-
Disconnect Heated Rear Seat Switch C3182
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3182-2
|
|
C3304A-2
|
C3182-2
|
|
Ground
|
Are the resistances less than 3 ohms between the
heated seat switch and heated seat module, and greater than 10,000 ohms
between the heated seat switch and ground?
Yes |
INSTALL a new heated rear seat switch. REFER to: Heated Rear Seat Switch (501-10B Rear Seats, Removal and Installation).
|
|
B3 CHECK FOR VOLTAGE TO THE HEATED SEAT MODULE |
-
Disconnect Heated Rear Seat Module C3304B
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304B-1
|
|
Ground
|
Is the voltage greater than 11 volts?
|
B4 CHECK THE HEATER CIRCUITS AND HEATER MATS FOR AN OPEN |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304B-4
|
|
Ground
|
Is the resistance between 2.5 and 4.5 ohms?
|
B5 CHECK THE HEATER MAT GROUND CIRCUIT FOR AN OPEN |
-
Disconnect
LH Rear Backrest Heater Mat C3168
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3168-2
|
|
Ground
|
Is the resistance less than 3 ohms?
|
B6 CHECK THE HEATER CIRCUIT FOR AN OPEN OR SHORT TO GROUND |
-
Disconnect
LH Rear Cushion Heater Mat C3167
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304B-4
|
|
C3167-1
|
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304B-4
|
|
Ground
|
Are the resistances less than 3 ohms between the heated seat module and
the LH rear cusion heater mat, and greater than 10,000 ohms between the
heated seat module and ground?
|
B7 CHECK THE CUSHION HEATER MAT FOR AN OPEN |
-
Measure the component side resistance between:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3167-1, Component Side
|
|
C3167-4, Component Side
|
Is the resistance between 1.5 and 2.5 ohms?
No |
INSTALL a new cushion heater mat. REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
|
|
B8 CHECK FOR AN OPEN OR A SHORT TO GROUND BETWEEN THE HEATER MATS |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3167-4
|
|
C3168-1
|
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3167-4
|
|
Ground
|
Are the resistances less than 3 ohms between the
cushion heater mat and backrest heater mat, and greater than 10,000 ohms
between cushion heater mat and ground?
Yes |
INSTALL a new backrest heater mat. REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
|
|
B9 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-3
|
|
Ground
|
Is any voltage present?
|
B10 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO GROUND |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-3
|
|
Ground
|
Is the resistance greater than 10,000 ohms?
|
B11 CHECK THE TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-3
|
|
C3304A-12
|
Is the resistance between 300 and 300K ohms?
Yes |
INSTALL a new heated rear seat module. REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).
|
|
B12 CHECK THE TEMPERATURE SENSOR FOR AN OPEN WITH THE HEATER MAT DISCONNECTED |
-
Disconnect
LH Rear Cushion Heater Mat C3167
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-3
|
|
C3167-2
|
C3304A-12
|
|
C3167-3
|
Are the resistances less than 3 ohms?
Yes |
INSTALL a new cushion heater mat. REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
|
No |
REPAIR the circuit in question.
|
|
The RH Heated Rear Seat is Inoperative
Refer to Wiring Diagrams Cell 119 for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Rear Seats (501-10 Rear Seats)
.
Possible Causes
-
Wiring, terminals or connectors
-
Heater mat
-
Heated seat switch
-
Heated seat module
PINPOINT TEST C: THE RH (RIGHT-HAND)
HEATED REAR SEAT IS INOPERATIVE
C1 CHECK THE HEATED SEAT SWITCH INPUT |
-
Disconnect Heated Rear Seat Module C3304A
.
-
While pressing and releasing the RH heated rear seat switch, measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-8
|
|
Ground
|
Is the resistance less than 3 ohms when the switch is pressed and greater than 10,000 ohms when released?
|
C2 CHECK THE HEATED SEAT SWITCH CIRCUIT FOR AN OPEN OR SHORT TO GROUND |
-
Disconnect Heated Rear Seat Switch C3182
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3182-3
|
|
C3304A-8
|
C3182-3
|
|
Ground
|
Are the resistances less than 3 ohms between the
heated rear seat switch and heated rear seat module, and greater than
10,000 ohms between the heated rear seat switch and ground?
Yes |
INSTALL a new heated rear seat switch. REFER to: Power Fold Seat Control Switch (501-10B Rear Seats, Removal and Installation).
|
|
C3 CHECK FOR VOLTAGE TO THE HEATED SEAT MODULE |
-
Disconnect Heated Rear Seat Module C3304B
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304B-3
|
|
Ground
|
Is the voltage greater than 11 volts?
|
C4 CHECK THE HEATER CIRCUITS AND HEATER MATS FOR AN OPEN |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304B-6
|
|
Ground
|
Is the resistance between 2.5 and 4.5 ohms?
|
C5 CHECK THE HEATER MAT GROUND CIRCUIT FOR AN OPEN |
-
Disconnect
RH Rear Backrest Heater Mat C3169
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3169-2
|
|
Ground
|
Is the resistance less than 3 ohms?
|
C6 CHECK THE HEATER CIRCUIT FOR AN OPEN OR SHORT TO GROUND |
-
Disconnect
RH Rear Cushion Heater Mat C3045
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304B-6
|
|
C3045-1
|
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304B-6
|
|
Ground
|
Are the resistances less than 3 ohms between the
heated rear seat module and rear seat cushion heater mat, and greater
than 10,000 ohms between the heated rear seat module and ground?
|
C7 CHECK THE CUSHION HEATER MAT FOR AN OPEN |
-
Measure the component side resistance between:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3045-1, Component Side
|
|
C3045-4, Component Side
|
Is the resistance between 1.5 and 2.5 ohms?
No |
INSTALL a new cushion heater mat. REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
|
|
C8 CHECK FOR AN OPEN OR A SHORT TO GROUND BETWEEN THE HEATER MATS |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3045-4
|
|
C3169-1
|
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3045-4
|
|
Ground
|
Are the resistances less than 3 ohms between the
rear seat cushion heater mat and rear seat backrest heater mat, and
greater than 10,000 ohms between the rear seat cushion heater mat and
ground?
Yes |
INSTALL a new backrest heater mat. REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
|
|
C9 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-9
|
|
Ground
|
Is any voltage present?
|
C10 CHECK THE TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO GROUND |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-9
|
|
Ground
|
Is the resistance greater than 10,000 ohms?
|
C11 CHECK THE TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-9
|
|
C3304A-12
|
Is the resistance between 300 and 300K ohms?
Yes |
INSTALL a new heated rear seat module. REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).
|
|
C12 CHECK THE TEMPERATURE SENSOR FOR AN OPEN WITH THE HEATER MAT DISCONNECTED |
-
Disconnect
RH Rear Cushion Heater Mat C3045
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-9
|
|
C3045-2
|
C3304A-12
|
|
C3045-3
|
Are the resistances less than 3 ohms?
Yes |
INSTALL a new backrest heater mat. REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
|
No |
REPAIR the circuit in question.
|
|
The LH Heated Rear Seat Heats Correctly But The Indicator Does Not Illuminate When Activated
Refer to Wiring Diagrams Cell 119 for schematic and connector information.
Normal Operation and Fault Conditions
With
the ignition and heated seat on, the heated seat module supplies
voltage to the indicator circuit(s) to illuminate the appropriate switch
indicator. The first button press puts the seat heater on low. A second
button press operates the seat heater on high. The heated seat and
indicator deactivates with a third button press.
Possible Causes
-
Wiring, terminals or connectors
-
Heated rear seat switch
-
Heated rear seat module
Visual Inspection and Diagnostic Pre-checks
-
Inspect for a damaged heated rear seat switch.
PINPOINT TEST D: THE LH (LEFT-HAND)
HEATED REAR SEAT HEATS CORRECTLY BUT THE INDICATOR DOES NOT ILLUMINATE WHEN ACTIVATED
D1 CHECK THE HEATED SEAT INDICATOR CIRCUITS FOR A SHORT TO GROUND |
-
Disconnect Heated Rear Seat Module C3304A
.
-
Disconnect Heated Rear Seat Switch C3182
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-4
|
|
Ground
|
C3304A-5
|
|
Ground
|
Are the resistances greater than 10,000 ohms?
No |
REPAIR the circuit in question.
|
|
D2 CHECK THE HEATED SEAT INDICATOR CIRCUITS FOR AN OPEN |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-4
|
|
C3182-6
|
C3304A-5
|
|
C3182-7
|
Are the resistances less than 3 ohms?
No |
REPAIR the circuit in question.
|
|
D3 CHECK THE HIGH HEAT INDICATOR |
-
Disconnect Heated Rear Seat Module C3304B
.
-
Connect Heated Rear Seat Switch C3182
.
-
Connect:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-5
|
|
C3304B-1
|
Does the indicator illuminate?
Yes |
REMOVE the fused jumper wire. GO to D4
|
No |
REMOVE the fused jumper wire. INSTALL a new heated rear seat switch. REFER to: Heated Rear Seat Switch (501-10B Rear Seats, Removal and Installation).
|
|
D4 CHECK THE LOW HEAT INDICATOR |
-
Connect:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-4
|
|
C3304B-1
|
Does the indicator illuminate?
Yes |
REMOVE the fused jumper wire. INSTALL a new heated rear seat module. REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).
|
No |
REMOVE the fused jumper wire. INSTALL a new heated rear seat switch. REFER to: Heated Rear Seat Switch (501-10B Rear Seats, Removal and Installation).
|
|
The RH Heated Rear Seat Heats Correctly But The Indicator Does Not Illuminate When Activated
Refer to Wiring Diagrams Cell 119 for schematic and connector information.
Normal Operation and Fault Conditions
With
the ignition and heated seat on, the heated seat module supplies
voltage to the indicator circuit(s) to illuminate the appropriate switch
indicator. The first button press puts the seat heater on low. A second
button press operates the seat heater on high. The heated seat and
indicator deactivates with a third button press.
Possible Causes
-
Wiring, terminals or connectors
-
Heated rear seat switch
-
Heated rear seat module
Visual Inspection and Diagnostic Pre-checks
-
Inspect for a damaged heated rear seat switch.
PINPOINT TEST E: THE RH (RIGHT-HAND)
HEATED REAR SEAT HEATS CORRECTLY BUT THE INDICATOR DOES NOT ILLUMINATE WHEN ACTIVATED
E1 CHECK THE HEATED SEAT INDICATOR CIRCUITS FOR A SHORT TO GROUND |
-
Disconnect Heated Rear Seat Module C3304A
.
-
Disconnect Heated Rear Seat Switch C3182
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-10
|
|
Ground
|
C3304A-11
|
|
Ground
|
Are the resistances greater than 10,000 ohms?
No |
REPAIR the circuit in question.
|
|
E2 CHECK THE HEATED SEAT INDICATOR CIRCUITS FOR AN OPEN |
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-10
|
|
C3182-4
|
C3304A-11
|
|
C3182-5
|
Are the resistances less than 3 ohms?
No |
REPAIR the circuit in question.
|
|
E3 CHECK THE HIGH HEAT INDICATOR |
-
Disconnect Heated Rear Seat Module C3304B
.
-
Connect Heated Rear Seat Switch C3182
.
-
Connect:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-11
|
|
C3304B-3
|
Does the indicator illuminate?
Yes |
REMOVE the fused jumper wire. GO to E4
|
No |
REMOVE the fused jumper wire. INSTALL a new heated rear seat switch. REFER to: Heated Rear Seat Switch (501-10B Rear Seats, Removal and Installation).
|
|
E4 CHECK THE LOW HEAT INDICATOR |
-
Connect:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3304A-10
|
|
C3304B-3
|
Does the indicator illuminate?
Yes |
REMOVE the fused jumper wire. INSTALL a new heated rear seat module. REFER to: Heated Rear Seat Module (501-10B Rear Seats, Removal and Installation).
|
No |
REMOVE the fused jumper wire. INSTALL a new heated rear seat switch. REFER to: Heated Rear Seat Switch (501-10B Rear Seats, Removal and Installation).
|
|
Both Rear Power Fold Seats Are Inoperative
Refer to Wiring Diagrams Cell 120 for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Rear Seats (501-10 Rear Seats)
.
Possible Causes
-
Fuse
-
Wiring, terminals or connectors
-
Demand lighting system concern
-
Second row seat control switch
-
BCM
Visual Inspection and Diagnostic Pre-checks
-
Verify BJB fuse 1 (30A) is OK.
PINPOINT TEST F: BOTH REAR POWER FOLD SEATS ARE INOPERATIVE
F1 CHECK THE DEMAND LIGHTING OPERATION |
-
Verify the demand lighting (map/reading lights, vanity mirror lamps) operates.
Do the demand lighting lamps operate?
No |
Diagnose the inoperative demand lighting system. REFER to: Interior Lighting (417-02 Interior Lighting)
.
|
|
F2 CHECK FOR BATTERY VOLTAGE TO THE SECOND ROW SEAT RELEASE LH (LEFT-HAND)
RELAY |
-
Disconnect Second Row Seat Release LH Relay.
-
Measure:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
Second Row Seat Relase LH Relay, socket pin 3
|
|
Ground
|
Is the voltage greater than 11 volts?
No |
VERIFY BJB
fuse 1 (30A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the
Wiring Diagrams manual to identify the possible causes of the circuit
short.
|
|
F3 CHECK THE ENABLE CIRCUIT FOR VOLTAGE TO THE SECOND ROW SEAT RELEASE LH (LEFT-HAND)
RELAY |
-
Measure:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
Second Row Seat Relase LH Relay, socket pin 1
|
|
Ground
|
Is the voltage greater than 11 volts?
|
F4 CHECK THE ENABLE CIRCUIT FOR AN OPEN |
-
Measure:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
Second Row Seat Relase LH Relay, socket pin 1
|
|
C2280D-11
|
Is the resistance less than 3 ohms?
|
F5 CHECK THE SECOND ROW SEAT CONTROL SWITCH GROUND CIRCUIT FOR AN OPEN |
-
Disconnect Second Row Seat Control Switch C3343
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3343-3
|
|
Ground
|
Is the resistance less than 3 ohms?
Yes |
INSTALL a new second row seat control switch. REFER to: Power Fold Seat Control Switch (501-10B Rear Seats, Removal and Installation).
|
|
F6 CHECK FOR CORRECT BCM (BODY CONTROL MODULE)
MODULE OPERATION |
-
Disconnect and inspect all the BCM connectors.
-
Repair:
-
corrosion (install new connector or terminals - clean module pins)
-
damaged or bent pins - install new terminals/pins as necessary
-
pushed-out pins - install new pins as necessary
-
Reconnect the BCM connectors and all previously disconnected system connectors. Make sure they seat and latch correctly.
-
Operate the system and determine if the concern is still present.
Is the concern still present?
Yes |
CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a
TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB
instructions. If no Technical Service Bulletins (TSBs) address this
concern, INSTALL a new BCM. Refer to the appropriate Removal and
Installation procedure in Section 419-10.
|
No |
The system is operating correctly at this time. The
concern may have been caused by module connections. ADDRESS the root
cause of any connector or pin issues.
|
|
The LH Rear Power Fold Seat Is Inoperative
Refer to Wiring Diagrams Cell 120 for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Rear Seats (501-10 Rear Seats)
.
Possible Causes
-
Wiring, terminals or connectors
-
Second row seat control switch
-
Second row rear seat motor
PINPOINT TEST G: THE LH (LEFT-HAND)
REAR POWER FOLD SEAT IS INOPERATIVE
G1 CHECK FOR VOLTAGE TO THE SECOND ROW SEAT RELEASE LH (LEFT-HAND)
RELAY |
-
Disconnect Second Row Seat Release LH Relay.
-
Measure:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
Second Row Seat Relase LH Relay, socket pin 3
|
|
Ground
|
Second Row Seat Relase LH Relay, socket pin 1
|
|
Ground
|
Are the voltages greater than 11 volts?
No |
REPAIR the circuit in question.
|
|
G2 CHECK FOR SECOND ROW SEAT CONTROL SWITCH INPUT TO THE LH (LEFT-HAND)
RELAY |
NOTICE:
The following step uses a test lamp to simulate
normal circuit loads. Use only a Rotunda Test Lamp (SGT27000) or 250-
300mA incandescent bulb test lamp. To avoid connector terminal damage,
use the Rotunda Flex Probe kit for the test lamp probe connection to the
vehicle. Do not use the test lamp probe directly on any connector.
-
Connect:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
Second Row Seat Relase LH Relay, socket pin 1
|
|
Second Row Seat Relase LH Relay, socket pin 2
|
-
Press and release the LH second row seat control switch while observing the test lamp.
Did the test lamp illuminate on and off when the seat control switch was pressed and released?
|
G3 CHECK THE SECOND ROW REAR SEAT CONTROL SWITCH CIRCUIT FOR AN OPEN OR SHORT TO GROUND |
-
Disconnect Second Row Seat Control Switch C3343
.
-
Measure:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3343-4
|
|
Second Row Seat Relase LH Relay, socket pin 2
|
C3343-4
|
|
Ground
|
Is the resistance less than 3 ohms between the
switch and the relay, and greater than 10,000 ohms between the switch
and ground?
Yes |
INSTALL a new second row seat control switch. REFER to: Power Fold Seat Control Switch (501-10B Rear Seats, Removal and Installation).
|
|
G4 CHECK THE SECOND ROW SEAT RELEASE LH (LEFT-HAND)
RELAY |
-
Disconnect Second Row Seat Release RH Relay.
-
Install the RH second row seat release relay in the LH second row seat release relay socket.
-
Attempt to operate the second row seat.
Does the seat operate correctly when the RH second row seat release
relay is installed in the LH second row seat release relay socket?
|
G5 CHECK THE SECOND ROW REAR SEAT MOTOR GROUND |
-
Disconnect
LH Second Row Rear Seat Motor C3345
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3345-2
|
|
Ground
|
Is the resistance less than 3 ohms?
|
G6 CHECK THE SECOND ROW REAR SEAT MOTOR CIRCUIT FOR AN OPEN |
-
Measure:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3345-1
|
|
Second Row Seat Relase LH Relay, socket pin 5
|
Is the resistance less than 3 ohms?
Yes |
INSTALL a new LH second row seat motor. REFER to: Power Fold Seat Motor (501-10 Rear Seats)
.
|
|
The RH Rear Power Fold Seat Is Inoperative
Refer to Wiring Diagrams Cell 120 for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Rear Seats (501-10 Rear Seats)
.
Possible Causes
-
Wiring, terminals or connectors
-
Second row seat control switch
-
Second row rear seat motor
PINPOINT TEST H: THE RH (RIGHT-HAND)
REAR POWER FOLD SEAT IS INOPERATIVE
H1 CHECK FOR VOLTAGE TO THE SECOND ROW SEAT RELEASE RH (RIGHT-HAND)
RELAY |
-
Disconnect Second Row Seat Release RH Relay.
-
Measure:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
Second Row Seat Relase RH Relay, socket pin 3
|
|
Ground
|
Second Row Seat Relase RH Relay, socket pin 1
|
|
Ground
|
Are the voltages greater than 11 volts?
No |
REPAIR the circuit in question.
|
|
H2 CHECK FOR SECOND ROW SEAT CONTROL SWITCH INPUT TO THE RH (RIGHT-HAND)
RELAY |
NOTICE:
The following step uses a test lamp to simulate
normal circuit loads. Use only a Rotunda Test Lamp (SGT27000) or 250-
300mA incandescent bulb test lamp. To avoid connector terminal damage,
use the Rotunda Flex Probe kit for the test lamp probe connection to the
vehicle. Do not use the test lamp probe directly on any connector.
-
Connect:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
Second Row Seat Relase RH Relay, socket pin 1
|
|
Second Row Seat Relase RH Relay, socket pin 2
|
-
Press and release the RH second row seat control switch while observing the test lamp.
Did the test lamp illuminate on and off when the seat control switch was pressed and released?
|
H3 CHECK THE SECOND ROW REAR SEAT CONTROL SWITCH CIRCUIT FOR AN OPEN OR SHORT TO GROUND |
-
Disconnect Second Row Seat Control Switch C3343
.
-
Measure:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3343-2
|
|
Second Row Seat Relase RH Relay, socket pin 2
|
C3343-2
|
|
Ground
|
Is the resistance less than 3 ohms between the
switch and the relay, and greater than 10,000 ohms between the switch
and ground?
Yes |
INSTALL a new second row seat control switch. REFER to: Power Fold Seat Control Switch (501-10B Rear Seats, Removal and Installation).
|
|
H4 CHECK THE SECOND ROW SEAT RELEASE RH (RIGHT-HAND)
RELAY |
-
Disconnect Second Row Seat Release LH Relay.
-
Install the LH second row seat release relay in the RH second row seat release relay socket.
-
Attempt to operate the second row seat.
Does the seat operate correctly when the LH second row seat release
relay is installed in the RH second row seat release relay socket?
|
H5 CHECK THE SECOND ROW REAR SEAT MOTOR GROUND |
-
Disconnect
RH Second Row Rear Seat Motor C3346
.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3346-2
|
|
Ground
|
Is the resistance less than 3 ohms?
|
H6 CHECK THE SECOND ROW REAR SEAT MOTOR CIRCUIT FOR AN OPEN |
-
Measure:
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C3346-1
|
|
Second Row Seat Relase RH Relay, socket pin 5
|
Is the resistance less than 3 ohms?
Yes |
INSTALL a new RH second row seat motor. REFER to: Power Fold Seat Motor (501-10 Rear Seats)
.
|
|
System Operation
Rear Heated Seats
The
heated seats operate in a sequence of high, low and off with each press
of the heated seat switch. Rear heated seats are equipped with a single
heated seat module to control both outboard rear heated seats...
Removal
Remove the rear seat cushion.
Refer to: Rear Seat Cushion (501-10B Rear Seats, Removal and Installation).
Release the seat cushion cover J-clips...
Other information:
Massage Seat Limitations
The engine must be running or the vehicle
must be in accessory mode to activate the
seats.
Allow a few seconds for any selection to
activate. When the seat backrest and cushion
are both active, the massage alternates
between zones...
Removal
NOTE:
Removal steps in this procedure may contain installation details.
Remove the wiper linkage assembly.
Refer to: Wiper Linkage Assembly (501-16 Wipers and Washers, Removal and Installation).
NOTICE:
Be careful not to damage the link seals during
removal...