Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Seat Adjuster Switch B+ | 1 | 1 | -- | -- |
Front Vertical Motor Down Control | 1 | 1 | -- | -- |
Front Vertical Motor Up Control | 1 | 1 | -- | -- |
Horizontal Motor Forward Control | 1 | 1 | -- | -- |
Horizontal Motor Rearward Control | 1 | 1 | -- | -- |
Rear Vertical Motor Down Control | 1 | 1 | -- | -- |
Rear Vertical Motor Up Control | 1 | 1 | -- | -- |
Recline Motor Forward Control | 1 | 1 | -- | -- |
Recline Motor Rearward Control | 1 | 1 | -- | -- |
Seat Adjuster Switch Ground | -- | 1 | -- | -- |
1. Power seat inoperative | ||||
Circuit/System Description
The power seat is controlled through the seat adjuster switch. Battery voltage is supplied at all times to the seat adjuster switches through the DRV SEAT 30 A fuse or the PSG SEAT 30 A fuse that are located in the rear fuse block. When the seat adjuster switches are in an inactive state, the switch contacts are closed to the switch ground circuit.
All seat motors are reversible. For example, when the seat horizontal forward switch is pressed to move the entire seat forward, battery voltage is applied through the switch contacts and the seat horizontal motor forward control circuit to the motor. The motor is grounded through the horizontal motor rearward switch contacts and the horizontal motor rearward control circuit to the motor. The motor runs in order to drive the entire seat forward until the switch is released. Moving the entire seat rearward works similarly to moving the entire seat forward, except that battery positive voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction. All seat motors are powered this way.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Power Seats System Description and Operation
Electrical Information Reference
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the seat adjuster switch.
- Ignition OFF, test for less than 5.0 Ω between the appropriate ground circuit terminal listed below and ground:
- Ignition ON, verify that a test lamp illuminates between the appropriate B+ circuit terminal listed below and ground:
- Ignition OFF, connect the harness connector at the seat adjuster switch and disconnect the harness connector at the appropriate seat motor.
- Connect a test lamp between the appropriate control circuit terminals listed below:
- Ignition ON, command the seat motor in both directions using the seat adjuster switch. The test lamp should turn ON when commanding the motor in both directions.
- If all circuits tests normal, test or replace the appropriate seat motor.
| • | Terminals A and G |
| • | Terminal B (AG1) |
| • | Terminal B (1LZ) |
| • | Terminal B (AG2) |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | Terminal F |
| • | Terminal D (AG1) |
| • | Terminal E (1LZ) |
| • | Terminal D (AG2) |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| • | Seat adjuster motors terminal A and terminal B |
| • | Seat back recline motor terminal 1 and terminal 5 |
| ⇒ | If the test lamp remains OFF during either of the commands, test both control circuits for a short to ground or an open/high resistance. If the circuits test normal, test or replace the seat adjuster switch. |
Component Testing
Seat Adjuster Switch Test
- Ignition OFF, disconnect the harness connector at the seat adjuster switch.
- Test for infinite resistance between each control terminal and the B+ terminal with the switch in the open position.
- Test for less than 1 Ω between each control terminal and the B+ terminal with the switch in the closed position.
- Test for less than 1 Ω between each control terminal and the ground terminal with the switch in the open position.
| ⇒ | If not the specified value, replace the seat adjuster switch. |
| ⇒ | If greater than the specified range, replace the seat adjuster switch. |
| ⇒ | If greater than the specified range, replace the seat adjuster switch. |
Seat Motors
- Ignition OFF, disconnect the harness connector at the appropriate seat motor.
- Install a 30 A fused jumper wire between one motor control terminal and 12 volts. Momentarily install a jumper wire between the other motor control terminal and ground. The seat motor should perform the appropriate UP/DOWN/FORWARD/REARWARD function.
- Reverse the jumper wires. The seat motor should perform operate in the opposite direction.
Important: When performing the following tests, make sure that the seat is not already in the position the test is attempting to produce.
| ⇒ | If the function does not perform as specified, replace the seat motor. |
| ⇒ | If the function does not perform as specified, replace the seat motor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
