Pinpoint Test T: The Power Seat Is Inoperative/Does Not Operate Correctly - Third Row Power-Fold Seat, Left
Seats
Pinpoint Tests
Pinpoint Test T: The Power Seat is Inoperative/Does Not Operate Correctly - Third Row Power-Fold Seat, Left
Refer to Wiring Diagram Set 120, Power Seats for schematic and connector information. Diagrams By Number
Normal Operation
The left third row power-fold seat relay coil side is supplied battery voltage on circuit SBB05 (GY/RD) and is hot at all times. The ground is supplied to each third row power-fold seat relay on the coil side through circuit CPS48 (BU) and controlled by the Smart Junction Box (SJB). When the left third row power-fold seat control switch is pressed, voltage is supplied through the switch side of the left third row power-fold seat relay on circuit SBB05 (GY/RD) and supplied ground on circuit GD149 (BK/GY). When pressing the left third row power-fold seat control switch in the opposite direction, the left third row power-fold seat control switch reverses the polarity to the left third row power-fold seat motor, which moves the third row seat backrest in the opposite direction.
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- Left third row power-fold seat control switch
- Left third row power-fold seat relay
- Left third row power-fold seat motor
PINPOINT TEST T: THE POWER SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - THIRD ROW POWER-FOLD SEAT, LEFT
NOTE: The SJB may also be identified as the Generic Electronic Module (GEM).
-------------------------------------------------
T1 CHECK LH SEAT OPERATION
- Turn the ignition on and place the transmission in NEUTRAL.
- Does the LH seat operate?
Yes
GO to T2.
No
GO to T3.
-------------------------------------------------
T2 CHECK CIRCUIT CPS53 (VT/BN) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Left Third Row Seat Relay C4183.
- Ignition ON.
- Measure the voltage between left third row seat relay C4183-87, circuit CPS53 (VT/BN), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
INSTALL a new left third row seat relay. TEST the system for normal operation.
-------------------------------------------------
T3 CHECK CIRCUIT SBB05 (GY/RD) FOR AN OPEN
- Ignition OFF.
- Disconnect: Left Third Row Seat Relay C4183.
- Measure the voltage between:
- left third row seat relay C4183-30, circuit SBB05 (GY/RD), harness side and ground.
- left third row seat relay C4183-86, circuit SBB05 (GY/RD), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to T4.
No
VERIFY Battery Junction Box (BJB) fuse 5 (30A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify possible causes of the circuit short. TEST the system for normal operation. Diagrams By Number
-------------------------------------------------
T4 CHECK LEFT THIRD ROW SEAT RELAY
- Carry out the component test on the left third row seat relay.
- Did the relay pass?
Yes
GO to T5.
No
INSTALL a new left third row seat relay. TEST the system for normal operation.
-------------------------------------------------
T5 CHECK CIRCUIT CPS48 (BU) FOR AN OPEN
- Disconnect: Right Third Row Seat Relay C4184.
- Disconnect: SJB C2280b.
- Measure the resistance between left third row seat relay C4183-85, circuit CPS48 (BU), harness side and SJB C2280b-32, circuit CPS48 (BU).
- Is the resistance less than 5 ohms?
Yes
GO to T6.
No
REPAIR the circuit. TEST the system for normal operation.
-------------------------------------------------
T6 CHECK CIRCUIT CPS53 (VT/BN) FOR AN OPEN
- Disconnect: Left Third Row Seat Control Switch C4179.
- Measure the resistance between left third row seat relay C4183-87, circuit CPS53 (VT/BN), harness side and left third row seat switch C4179-4, circuit CPS53 (VT/BN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to T7.
No
REPAIR the circuit. TEST the system for normal operation.
-------------------------------------------------
T7 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN
- Measure the resistance between:
- left third row power-fold seat control switch C4179-8, circuit GD149 (BK/GY), harness side and ground.
- left third row power-fold seat control switch C4179-2, circuit GD149 (BK/GY), harness side and ground.
- Are the resistances less than 5 ohms?
Yes
GO to T8.
No
REPAIR the circuit. TEST the system for normal operation.
-------------------------------------------------
T8 CHECK LEFT THIRD ROW POWER-FOLD SEAT CONTROL SWITCH
- Disconnect: Left Third Row Power-Fold Seat Control Switch C4179.
- Using the following table, check the left third row power-fold seat control switch. Measure the resistance between the left third row power-fold seat control switch pins, component side, while pressing the indicated switch buttons and compare the results to the table. The resistance measurement must fall within the tolerance given.
- Carry out the Third Row Power-Fold Seat Control Switch Component Test.
- Did the switch pass?
Yes
GO to T9.
No
INSTALL a new switch. REFER to Seat Control Switch - Third Row Seat Control Switch - Third Row. TEST the system for normal operation.
-------------------------------------------------
T9 CHECK CIRCUITS CPS50 (BU/BN) AND CPS49 (BN/GN) FOR AN OPEN
- Disconnect: Left Third Row Seat Motor C4181.
- Measure the resistance between:
- left third row seat switch C4179-3, circuit CPS50 (BU/BN), harness side and left third row seat motor C4181-1, circuit CPS50 (BU/BN), harness side.
- left third row seat switch, C4179-7, circuit CPS49 (BN/GN), harness side and left third row seat motor C4181-2, circuit CPS49 (BN/GN), harness side.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new left third row power seat motor. REFER to Seat Control Switch - Third Row Seat Control Switch - Third Row. TEST the system for normal operation.
No
REPAIR the circuit(s). TEST the system for normal operation.
-------------------------------------------------