Pinpoint Test A: The Power Seat is Inoperative

Seats

Pinpoint Tests

Pinpoint Test A: The Power Seat is Inoperative

Refer to Wiring Diagram Set 120, Power Seats for schematic and connector information. Diagrams By Number

Normal Operation

The seat control switch is supplied battery voltage on circuit SBB74 (YE/RD) and ground on circuit GD133 (BK). The seat control switch then supplies voltage and ground to the appropriate circuits to operate the seat motors.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Seat control switch


PINPOINT TEST A: THE POWER SEAT IS INOPERATIVE

NOTICE: Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition switch is ON.

NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

NOTE: During testing, wire colors may change as they pass through connectors.

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A1 CHECK VOLTAGE TO THE SEAT CONTROL SWITCH


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Driver Seat Safety Belt Buckle Pretensioner C3338.
- Disconnect: Seat Control Switch C360.

- WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.

- Connect the battery ground cable.
- Measure voltage between seat control switch C360-2, circuit SBB74 (YE/RD), harness side and ground.




- Is voltage greater than 10 volts?

Yes
GO to A2.

No
VERIFY Battery Junction Box (BJB) fuse 74 (30A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. DISCONNECT the battery ground cable. CONNECT driver seat safety belt buckle pretensioner C3338. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering. TEST the system for normal operation. Diagrams By Number

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A2 CHECK FOR AN OPEN GROUND CIRCUIT TO THE SEAT CONTROL SWITCH


- Measure resistance between seat control switch C360-4, circuit GD133 (BK), harness side and ground.




- Is resistance less than 5 ohms?

Yes
INSTALL a new seat control switch. REFER to Seat Control Switch Seat Control Switch. DISCONNECT the battery ground cable. CONNECT driver seat safety belt buckle pretensioner C3338. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering. TEST the system for normal operation.

No
REPAIR the circuit. DISCONNECT the battery ground cable. CONNECT driver seat safety belt buckle pretensioner C3338. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering. TEST the system for normal operation.

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