Power Seat Inoperative (Without Memory A45)
Power Seat Inoperative (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
Power seats without memory are completely controlled through the seat adjuster switch. Battery voltage is supplied at all times to the seat adjuster switch from the 25A DRIVER SEAT or PASS SEAT circuit breaker that is located in the left I/P 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
* Driver Seat Schematics Driver Seat Schematics
* Passenger Seat Schematics Passenger Seat Schematics
Connector End View Reference
Component Connector End Views Connector Views
Description and Operation
Power Seats System Description and Operation (Rear Folding Seat) Power Seats System (Rear Folding Seat)Power Seats System Description and Operation (Front Seat) Power Seats System (Front Seat)
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
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Operate the switches for the seat directional motors listed below in both directions. The seat should move in the commanded directions.
* Horizontal Motor
* Front Vertical Motor
* Rear Vertical Motor
* Recline Motor
If the power seat is inoperative in all directions, refer to the Seat Adjuster Switch Circuit Test.
If just the seat recline function is inoperative, refer to the Recline Motor Circuit Test.
If 1 or more of the seat adjuster motors operate, refer to the appropriate Seat Adjuster Motor Circuit Test.
Circuit/System Testing
Seat Adjuster Switch Circuit Test
1. Ignition OFF, disconnect the harness connector at the seat adjuster switch.
2. Test for less than 5 Ohms between the ground circuit terminal B and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the appropriate B+ circuit terminal listed below and ground:
* 6-way power seat terminal D
* 8-way power seat terminal E
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, test or replace the seat adjuster switch.
Recliner Motor Circuit Test
1. Ignition OFF, disconnect the harness connector at the seat recline motor.
2. Connect that a test lamp between control circuit terminal 1 and control circuit terminal 2.
3. Ignition ON, command the seat recline motor Forward and Rearward using the seat adjuster switch. The test lamp should turn ON when commanding the forward and rearward states.
• If the test lamp remains OFF for either of the commands, test the control circuits for a short to ground or an open/high resistance. If the circuits test normal, test or replace the seat adjuster switch.
4. If all circuits test normal, test or replace the seat recline motor.
Seat Adjuster Motor Circuit Test (Without HP2)
1. Ignition OFF, disconnect the harness connector at the seat adjuster assembly.
2. Connect a test lamp between the appropriate control circuit terminals listed below:
* Seat horizontal motor terminal 3 and terminal 6
* Seat front vertical motor terminal 2 and terminal 5
* Seat rear vertical motor terminal 1 and terminal 4
3. Ignition ON, command the seat motor Up and Down or Forward and Rearward using the seat adjuster switch. The test lamp should turn ON when commanding the up and down or forward and rearward states.
• If the test lamp remains OFF for either of the commands, test the control circuits for a short to ground or an open/high resistance. If the circuits test normal, test or replace the seat adjuster switch.
4. If all circuits test normal, test or replace the seat adjuster assembly.
Power Seat Adjuster Motor Circuit Test (With HP2)
1. Ignition OFF, disconnect the harness connector at the appropriate seat motor.
2. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2.
3. Ignition ON, command the appropriate seat motor Up and Down or Forward and Rearward using the seat adjuster switch. The test lamp should turn ON when commanding the up and down or forward and rearward states.
• If the test lamp remains OFF for either of the commands, test the control circuits for a short to ground or an open/high resistance. If the circuits test normal, test or replace the seat adjuster switch.
4. If all circuits test normal, test or replace the seat motor.
Component Testing
Seat Adjuster Switch Test
1. Ignition OFF, disconnect the harness connector at the seat adjuster switch.
2. Test for infinite resistance between each control terminal and the B+ terminal with the switch in the open position.
• If less than the specified value, replace the seat adjuster switch.
3. Test for less than 1 ohm between each control terminal and the B+ terminal with the switch in the closed position.
• If greater than the specified range, replace the seat adjuster switch.
4. Test for less than 1 ohm between each control terminal and the ground terminal with the switch in the open position.
• If greater than the specified range, replace the seat adjuster switch.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Power Seat Switch Replacement (with HP2) Power Seat Switch ReplacementPower Seat Switch Replacement (without HP2) Power Seat Switch Replacement
* Front Seat Adjuster Replacement (without HP2) Front Seat Adjuster ReplacementFront Seat Adjuster Replacement (with HP2) Front Seat Adjuster Replacement
* Front Seat Recliner Actuator Motor Replacement Front Seat Recliner Actuator Motor Replacement
* Rear Seat Recliner Actuator Replacement (with Bucket Seat) Rear Seat Recliner Actuator Replacement (with Bucket Seat)Rear Seat Recliner Actuator Replacement (with Split Bench Seat) Rear Seat Recliner Actuator Replacement (with Split Bench Seat)