The memory seat module (MSM) receives voltage inputs from the tilt switch based on the position of the switch. The MSM then supplies battery voltage and a ground to the tilt motor control circuits depending on which direction of movement is requested.

Schematic Reference

Steering Wheel Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Steering Wheel and Column Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for Scan Tool Information

1. Ignition ON, observe the scan tool Tilt Up Switch and the Tilt Down Switch parameters while cycling the tilt switch between the TILT UP and TILT DOWN positions. The appropriate parameter should cycle between Inactive and Active.

⇒	If any of the parameters do not cycle between the specified values, refer to Tilt Switch Circuit Malfunction.

2. Command the column to tilt up and down using the tilt switch. The column should move in the commanded direction.

⇒	If the column does not operate as specified, refer to Tilt Actuator Circuit Malfunction.

Tilt Switch Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the tilt switch.
2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal B and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Verify both scan tool tilt switch parameters are Inactive.

•	Tilt Up Switch - control circuit terminal C

•	Tilt Down Switch - control circuit terminal A

⇒	If any of the parameters are not the specified value, test the appropriate control circuit terminal for a short to voltage. If the circuit tests normal, replace the MSM.

4. Install a 3A fused jumper wire between the B+ circuit terminal B and the control circuit terminals listed below. Verify both scan tool tilt switch parameters are Active.

•	Tilt Up Switch - control circuit terminal C

•	Tilt Down Switch - control circuit terminal A

⇒	If not the specified value, test the appropriate control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.

5. If all circuit test normal, test or replace the tilt switch.

Tilt Actuator Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the tilt actuator.
2. Install a test lamp between the control circuit terminal A and the control circuit terminal B.
3. Command the column to tilt up and down using the tilt switch. The test lamp should illuminate with each command.

⇒	If the test lamp does not illuminate, test both control circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the MSM.

4. If all circuits test normal, test or replace the tilt actuator.

Tilt Switch

1. Ignition OFF, disconnect the harness connector at the tilt switch.
2. Test for infinite resistance between the B+ terminal B and the terminals listed below with the switch in the neutral position:

•	control terminal A

•	control terminal C

⇒	If less than the specified range, replace the tilt switch.

3. Test for less than 1 ohm between the B+ terminal B and the control terminal C with the switch in the TILT UP position.

⇒	If greater than the specified range, replace the tilt switch.

4. Test for less than 1 ohm between the B+ terminal B and the control terminal A with the switch in the TILT DOWN position.

⇒	If greater than the specified range, replace the tilt switch.

Tilt Actuator

1. Ignition OFF, disconnect the harness connector at the tilt actuator.
2. Test for less than 2.0 ohms between the control terminal A and the control terminal B.

⇒	If greater than the specified range, replace the tilt actuator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.