Pinpoint Test BB: The Power Seat is Inoperative/Does Not Operate Correctly - Left Rear, Power Fold
Seats
Pinpoint Tests
Pinpoint Test BB: The Power Seat is Inoperative/Does Not Operate Correctly - Left Rear, Power Fold
Refer to Wiring Diagram Set 120, Power Seats for schematic and connector information. Diagrams By Number
Normal Operation
The rear seat power-fold relay is provided voltage on the coil side from the Smart Junction Box (SJB), on pin 2, circuit CPS 48 (BU), for 30 minutes after turning the vehicle off, when the transmission selector is in PARK and the liftgate is open. Ground for the coil side of the relay is on pin 1, circuit GD120 (BK/GN). The rear seat power-fold relay switched side is supplied voltage from Battery Junction Box (BJB) fuse 27 (10A) on relay pin 3, and is hot at all times. Pushing the double-throw switch to the appropriate rear seat release actuator, left or right, will provide voltage from relay pin 5 and allow folding of that seat. If the relay is disabled after 30 minutes, it can be enabled as long as the transmission is in PARK by opening any door, pressing the unlock key on the key fob, pressing any keyless keypad button or turning the ignition key.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Rear seat control switch
- Left power-fold seat actuator
- Power-fold relay
PINPOINT TEST BB: THE POWER SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - LEFT REAR, POWER FOLD
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BB1 CHECK LH SEAT OPERATION
- Ignition ON.
- Select NEUTRAL.
- Press the rear seat control switch to release the left side backrest.
- Does the LH seat operate all the time?
Yes
GO to BB2.
No
GO to BB3.
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BB2 CHECK CIRCUIT CPS58 (WH/BN) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: BJB Power-Fold Relay 25.
- Disconnect: Rear Seat Control Switch C4351.
- Ignition ON.
- Measure the voltage between rear seat control switch C4351-2, circuit CPS58 (WH/BN), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
INSTALL a new power-fold relay. TEST the system for normal operation.
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BB3 CHECK THE REAR SEAT CONTROL SWITCH
- Select PARK.
- Ignition OFF.
- Gain access to the rear seat control switch C4351.
- Back probe for voltage between rear seat control switch C4351-1, circuit CPS56 (GN/BN), harness side and ground.
- NOTE: If the relay is disabled after 30 minutes, it can be enabled by opening any door, pressing the unlock key on the key fob, pressing any keyless keypad button or turning the ignition key.
- While back probing for voltage, press the rear seat control switch to release the left side backrest.
- Is the voltage greater than 10 volts when rear seat control switch is depressed?
Yes
GO to BB4.
No
INSTALL a new rear seat control switch. REFER to Seat Control Switch - Rear Seat Seat Control Switch - Rear Seat. TEST the system for normal operation.
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BB4 CHECK CIRCUIT CPS56 (GN/BN) FOR AN OPEN
- Disconnect: Left Power-Fold Actuator C3317.
- Measure the voltage between left power-fold actuator C3317-1, circuit CPS56 (GN/BN), harness side and ground while pressing the rear seat control switch to release the left side backrest.
- Is the voltage greater than 10 volts when rear seat control switch is depressed?
Yes
GO to BB5.
No
REPAIR the circuit. TEST the system for normal operation.
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BB5 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN
- Measure the voltage between left power-fold actuator C3317-1, circuit CPS56 (GN/BN), harness side and C3317-2, circuit GD126 (BK/WH), harness side while pressing the rear seat control switch to release the left side backrest.
- Is the voltage greater than 10 volts when rear seat control switch is depressed?
Yes
INSTALL a new left power-fold actuator. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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