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Power Seat Malfunction (Without Memory A45)





Power Seat Malfunction (Without Memory A45)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information






Circuit/System Description

The driver seat without memory and the passenger seat are completely controlled through their respective seat adjuster switches. Battery voltage is supplied at all times to the seat adjuster switch through a circuit breaker located in the instrument panel fuse block. When the seat 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. With the horizontal motor rearward switch contacts closed to the switch ground circuit, 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 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

* Driver Seat Schematics Driver Seat Schematics

* Passenger Seat Schematics Passenger Seat Schematics

Connector End View Reference

Component Connector End Views Sunshade - Left

Description and Operation

Power Seats System Description and Operation Power Seats System

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Circuit/System Verification

1. Verify the M57D Seat Vertical Motor - Driver operates when pressing the seat switch in both directions.

• If the seat vertical motor does not operate
Refer to Circuit/System Testing: 2-Way Power Seat Circuit Test.

• If the seat vertical motor operates

2. Verify the passenger seat directional motors listed below operate while operating the seat switches in both directions.

* M51 Seat Horizontal Motor

* M50 Seat Front Vertical Motor

* M55 Seat Rear Vertical Motor

* M56 Seat Recline Motor

• If all seat motors do not operate
Refer to the Circuit/System Testing: 8-Way Seat Adjuster Switch Circuit Test.

• If 1 or more seat motors operate
Refer to the Circuit/System Testing: 8-Way Power Seat Motor Circuit Test.

• If all seat motors operate

3. All OK.

Circuit/System Testing

2-Way Power Seat Circuit Test

1. Ignition OFF, disconnect the harness connector at the S64D Seat Adjuster Switch - Driver.

2. Test for less than 5 ohms between each ground circuit terminal listed below and ground:

* Terminal A

* Terminal C

• If 5 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 5 ohms

3. Ignition ON.

4. Verify a test lamp illuminates between the B+ circuit terminal D and ground.

• If the test lamp does not illuminate

1. Ignition OFF

2. Test for less than 2 ohms in the B+ circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, verify the circuit breaker is not open and there is voltage at the circuit breaker.

• If the test lamp illuminates

5. Ignition OFF, connect the harness connector at the S64D Seat Adjuster Switch - Driver and disconnect the harness connector at the M57D Seat Vertical Motor - Driver.

6. Connect a test lamp between control circuit terminal 1 and control circuit terminal 5, ignition ON.

7. Verify the test lamp turns ON when commanding the M57D Seat Vertical Motor - Driver Up and Down using the seat adjuster switch.

• If the test lamp does not turn ON during either of the commands

1. Ignition OFF, disconnect the harness connector at the M57D Seat Vertical Motor - Driver.

2. Test for less than 2 ohms in each control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, test or replace the M57D Seat Vertical Motor - Driver.

• If the test lamp turns ON during each of the commands

8. Test or replace the M57D Seat Vertical Motor - Driver.

8-Way Seat Adjuster Switch Circuit Test

1. Ignition OFF, disconnect the harness connector at the appropriate S64 Seat Adjuster Switch.

2. Test for less than 5 ohms between the ground circuit terminal B and ground.

• If 5 ohms or greater

1. Ignition OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 5 ohms

3. Ignition ON.

4. Verify a test lamp illuminates between the B+ circuit terminal E and ground.

• If the test lamp does not illuminate

1. Ignition OFF

2. Test for less than 2 ohms in the B+ circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, verify the circuit breaker is not open and there is voltage at the circuit breaker.

• If the test lamp illuminates

5. Test or replace the S64 Seat Adjuster Switch.

8-Way Power Seat Motor Circuit Test

1. Ignition OFF, disconnect the harness connector at the appropriate seat motor listed below:

* M51 Seat Horizontal Motor

* M50 Seat Front Vertical Motor

* M55 Seat Rear Vertical Motor

* M56 Seat Recline Motor

2. Connect a test lamp between control circuit terminal 1 and control circuit terminal 5, ignition ON.

3. Verify the test lamp turns ON when commanding the seat motor Up and Down or Forward and Rearward using the S64 Seat Adjuster Switch.

• If the test lamp does not turn ON during either of the commands

1. Ignition OFF, disconnect the harness connector at the S64 Seat Adjuster Switch.

2. Test for less than 2 ohms in each control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, test or replace the S64 Seat Adjuster Switch.

• If the test lamp turns ON during each of the commands

4. Test or replace the seat motor.

Component Testing

Seat Adjuster Switch Test

1. Ignition OFF, disconnect the harness connector at the appropriate S64 Seat Adjuster Switch.

2. Test for infinite resistance between the B+ terminal and each control terminal with the switch in the open position.

• If less than infinite resistance
Replace the S64 Seat Adjuster Switch.

• If infinite resistance

3. Test for less than 2 ohms between the B+ terminal and each control terminal with the appropriate switch in the closed position.

• If 2 ohms or greater
Replace the S64 Seat Adjuster Switch.

• If less than 2 ohms

4. Test for less than 2 ohms between the ground terminal and each control terminal with the switch in the open position.

• If 2 ohms or greater
Replace the S64 Seat Adjuster Switch.

• If less than 2 ohms

5. All OK.

Seat Motor

1. Ignition OFF, disconnect the harness connector at the appropriate seat motor listed below:

* M51 Seat Horizontal Motor

* M50 Seat Front Vertical Motor

* M55 Seat Rear Vertical Motor

* M56 Seat Recline Motor

Note: When performing the following tests, make sure that the seat is not already in the position the test is attempting to produce.

2. Install a 30 A fused jumper wire between control terminal 1 and B+.

3. Momentarily install a jumper wire between control terminal 5 and ground. The seat motor should momentarily perform the appropriate FORWARD/ REARWARD/ UP/ DOWN function.

• If the motor does not perform the FORWARD/ REARWARD/ UP/ DOWN function
Replace the motor.

• If the motor performs the FORWARD/ REARWARD/ UP/ DOWN function

4. Reverse the jumper wires; the motor should perform FORWARD/ REARWARD/ UP/ DOWN function.

• If the motor does not perform the FORWARD/ REARWARD/ UP/ DOWN function
Replace the motor.

• If the motor performs the FORWARD/ REARWARD/ UP/ DOWN function

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Driver Seat Adjuster and Recliner Switch Replacement Driver Seat Adjuster and Recliner Switch Replacement

* Passenger Seat Adjuster Switch Replacement Passenger Seat Adjuster Switch Replacement

* Front Seat Tilt Adjuster Actuator Replacement Front Seat Tilt Adjuster Actuator Replacement

* Front Seat Adjuster Actuator Replacement Front Seat Adjuster Actuator Replacement

* Driver Seat Outer Adjuster Rear Vertical Actuator Replacement Driver Seat Outer Adjuster Rear Vertical Actuator Replacement

* Driver or Passenger Seat Recliner Actuator Replacement Driver or Passenger Seat Recliner Actuator Replacement

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