C212C-12

C212C-12-SUSPENSION VALVE POWER SUPPLY VOLTAGE - CIRCUIT SHORT TO BATTERY

For a complete wiring diagram, refer to the Wiring Information.





- When Monitored:
Ignition on. Battery voltage between 9 and 16 volts.

- Set Condition:
When the Air Suspension Control Module (ASCM) detects battery voltage on the on-board 12 volt power supply before it has been turned on.





Diagnostic Test

1. DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. With the scan tool, read the DTCs in the ASCM.

Is the DTC status Active at this time?

Yes

- Go To 2

No

- Go To 6

2. (Y30) 12 VOLT VALVE POWER SUPPLY SHORTED TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the ASCM C2 harness connector.
3. Disconnect the Air Suspension Solenoid Assembly harness connector.
4. Turn the ignition on.
5. Measure the voltage of the (Y30) 12 Volt Valve Power Supply.

Is any voltage present?

Yes

- Repair the (Y30) 12 Volt Valve Power Supply circuit for a short to voltage.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Go To 3

3. (Y38) COMPRESSOR RELAY SIGNAL SHORTED TO VOLTAGE




1. Turn the ignition off.
2. Remove the Air Suspension Relay.
3. Turn the ignition on.
4. Measure the voltage of the (Y38) Compressor Relay Signal.

Is any voltage present?

Yes

- Repair the (Y30) 12 Volt Valve Power Supply circuit for a short to voltage.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Go To 4

4. (Y39) COMPRESSOR RELAY RETURN SHORTED TO VOLTAGE




1. Measure the voltage of the (Y39) Compressor Relay Return.

Is any voltage present?

Yes

- Repair the (Y30) 12 Volt Valve Power Supply circuit for a short to voltage.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Go To 5

5. (Y47) 12 VOLT REVERSE VALVE SUPPLY SHORTED TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the Air Suspension Compressor Assembly harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (Y47) 12 Volt Reverse Valve Supply.

Is any voltage present?

Yes

- Repair the (Y30) 12 Volt Valve Power Supply circuit for a short to voltage.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Replace the Air Suspension Control Module (ASCM). Air Suspension Control Module - Removal.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

6. INTERMITTENT WIRING AND CONNECTORS
1. Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors.
2. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
3. Look for the data to change or for the DTC to reset during the wiggle test.
4. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
5. Look for the data to change other than as expected or for the DTC to reset.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time.