B0946

DTC B0946

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.

DTC Descriptor
DTC B0946 01
- Suspension Control Selection Indicator Circuit Short to Battery

Diagnostic Fault Information





Circuit/System Description

The air suspension control module (ASCM) monitors the electronic ride height ERH switch active indicator signal for a short to battery.

Conditions for Running the DTC

* Battery voltage is between 9-16 volts.
* The ignition is ON or OFF.

Conditions for Setting the DTC

The ASCM senses the ERH active indicator light emitting diode LED signal circuit voltage shorted to battery.

Action Taken When the DTC Sets

* The air suspension system will be inoperative.
* No message is displayed.

Conditions for Clearing the MIL/DTC

The DTC will clear when the condition for setting the DTC is removed.

Reference Information
Schematic Reference

Air Suspension Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Air Suspension Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit Validation

Ignition ON, observe the scan tool ERH Switch Indicator parameter while pressing/depressing the ERH switch. The ERH switch indicator reading should change between OFF/ON and ON/OFF.

Circuit/System Testing

1. Ignition OFF, disconnect the automatic suspension control module (ASCM) harness connector at the electronic ride height ERH switch.
2. Test for less than 2.0 ohms between the IP multifunction assembly ground circuit connector X1 terminal 10 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool ERH switch Indicator parameter is OFF.

• If not the specified value, test the ASCM ride height active signal circuit terminal A2 for a short to voltage. If the circuit tests normal, test or replace the ASCM.

4. Install a 3A fused jumper wire between the ASCM ERH switch ride height active indicator control signal circuit terminal A2 and the ground circuit connector X1 terminal 10. Verify the scan tool ERH Switch Indicator parameter is ON.

• If not the specified value, test the ASCM ride height active signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ASCM.

5. If all circuits test normal, test or replace the ERH Switch.

Component Testing

1. Ignition OFF, disconnect the harness at the ERH switch.
2. Test for infinite resistance between the I/P multifunction switch assembly ride height active indicator control signal circuit terminal A2 and the I/P multifunction switch assembly ground circuit connector X1 terminal 10 with the switch in the open position. (Pressed)

• If not the specified value, replace the ERH switch.

3. Test for less than 2 ohms between the signal circuit terminal A2 and the ground circuit connector X1 terminal 10 with the switch in the closed position (Released).

• If greater than the specified value, replace the ERH switch.

4. Test for infinite resistance between each terminal and the ERH switch housing/case.

• If not the specified value, replace the ERH switch.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Rear Air Suspension Control Valve Switch Replacement (Rear Air Suspension Control Valve Switch Replacement)
* Suspension Position Calibration (Suspension Position Calibration)
* Control Module References (Programming and Relearning) for ASCM replacement, setup, and programming