Pinpoint Test A: The Power Seat Is Inoperative - Driver, With Power Recliner
Seats
Pinpoint Tests
Pinpoint Test A: The Power Seat is Inoperative - Driver, With Power Recliner
Refer to Wiring Diagram Set 120, Power Seats for schematic and connector information. Diagrams By Number
Normal Operation
The driver seat control switch is powered by battery voltage on circuit SBB74 (YE/RD) and is supplied ground on circuit GD143 (BK/VT). When pressed, the seat control switch supplies that voltage and ground to a power seat track motor or power recline motor to move the seat or backrest. When pressed in the opposite direction, the seat control switch reverses the polarity to that same power seat track motor or power recline motor, which moves the seat or backrest in the opposite direction. There are 3 power seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (front up/down and rear up/down). There is an additional motor in the power recline mechanism to move the seat backrest forward and rearward. If a new seat track motor needs to be installed, it is necessary to install an entire power seat track.
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 - DRIVER, WITH POWER RECLINER
NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition is ON.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
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A1 CHECK FOR 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 C3049.
- Disconnect: Driver Seat Side Air Bag C3051.
- Disconnect: Driver Seat Control Switch C3016.
- 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. Refer to Battery, Mounting and Cables Battery Disconnect.
- Measure the voltage between driver seat control switch C3016-5, circuit SBB74 (YE/RD), harness side and ground.
- Is the 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 possible causes of the circuit short. TEST the system for normal operation. Diagrams By Number
DISCONNECT the battery ground cable. CONNECT driver safety belt buckle pretensioner C3049.
CONNECT driver seat side air bag module C3051.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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A2 CHECK THE SEAT CONTROL SWITCH GROUND CIRCUIT FOR AN OPEN
- Measure the resistance between driver seat control switch C3016-3, circuit GD143 (BK/VT), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new driver seat control switch. REFER to Seat Control Switch - Front Seat Control Switch - Front. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT driver safety belt buckle pretensioner C3049.
CONNECT driver seat side air bag module C3051.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
REPAIR the circuit. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT driver safety belt buckle pretensioner C3049.
CONNECT driver seat side air bag module C3051.
REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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