Pinpoint Test Y: The Power Seat Is Inoperative/Does Not Operate Correctly - Left Rear, Power Fold
Seats
Pinpoint Test Y: 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 Electrical Diagrams.
Normal Operation
The rear seat release relay, located in the Battery Junction Box (BJB), is controlled by the Body Control Module (BCM). The BCM (Body Control Module) activates the rear seat release relay by providing voltage to the coil side for 30 minutes after turning the vehicle off, when the transmission selector is in PARK and the liftgate is open. Ground is provided at all times to the other side of the coil. When the rear seat release relay is activated, voltage is supplied to the rear power seat release switch. When the rear power seat release switch is activated, voltage is supplied to the appropriate rear seat release actuator, left or right, to allow folding of that seat. If the rear seat release relay has been deactivated after 30 minutes, it can be reactivated 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 cycling the ignition.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Rear power seat release switch
- Left power-fold seat actuator
- Rear seat release relay
PINPOINT TEST Y : THE POWER SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - LEFT REAR, POWER FOLD
Y1 CHECK LH SEAT OPERATION
- Ignition ON.
- Select NEUTRAL.
- Press the rear power seat release switch to release the left side backrest.
Does the LH seat operate all the time?
Yes
GO to Y2.
No
GO to Y3.
Y2 CHECK THE REAR POWER SEAT RELEASE SWITCH CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Rear Seat Release Relay.
- Disconnect: Rear Power Seat Release Switch C4351.
- Ignition ON.
- Measure the voltage between rear power seat release 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 rear seat release relay. TEST the system for normal operation.
Y3 CHECK THE REAR POWER SEAT RELEASE SWITCH
- Select PARK.
- Ignition OFF.
- Gain access to the rear power seat release switch C4351.
- Back probe for voltage between rear power seat release 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 power seat release switch to release the left side backrest.
Is the voltage greater than 10 volts when rear power seat release switch is pressed?
Yes
GO to Y4.
No
INSTALL a new rear power seat release switch. REFER to Seat Control Switch - Rear Seat . TEST the system for normal operation.
Y4 CHECK THE POWER-FOLD ACTUATOR POWER CIRCUIT 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 power seat release switch to release the left side backrest.
Is the voltage greater than 10 volts when rear power seat release switch is pressed?
Yes
GO to Y5.
No
REPAIR the circuit. TEST the system for normal operation.
Y5 CHECK THE POWER-FOLD ACTUATOR GROUND CIRCUIT 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 power seat release switch to release the left side backrest.
Is the voltage greater than 10 volts when rear power seat release switch is pressed?
Yes
INSTALL a new left power-fold actuator. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.