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. |
DTC Descriptor
DTC B0946 01: Suspension Control Selection Indicator Circuit Short to BatteryDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ride Height Active Indicator Control | -- | 1 | B0946 01 | -- |
Accessory Switch portion of the Instrument Panel Multifunction Switch Assembly-Ground | 1 | 1 | -- | -- |
1. ERH Switch Indicator Inoperative | ||||
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
Connector End View Reference
Description and Operation
Air Suspension Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References 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
- Ignition OFF, disconnect the automatic suspension control module (ASCM) harness connector at the electronic ride height ERH switch.
- Test for less than 2.0 ohms between the IP multifunction assembly ground circuit connector X1 terminal 10 and ground.
- Ignition ON, verify the scan tool ERH switch Indicator parameter is OFF.
- 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 all circuits test normal, test or replace the ERH Switch.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | 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. |
| ⇒ | 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. |
Component Testing
- Ignition OFF, disconnect the harness at the ERH switch.
- 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)
- 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).
- Test for infinite resistance between each terminal and the ERH switch housing/case.
| ⇒ | If not the specified value, replace the ERH switch. |
| ⇒ | If greater than the specified value, replace the ERH switch. |
| ⇒ | If not the specified value, replace the ERH switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ASCM replacement, setup, and programming |
