C1562-13

C1562-13-RIDE HEIGHT AIR PUMP CONTROL - CIRCUIT OPEN

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 an open relay or circuit while the ignition is in the Run position.





Diagnostic Test

1. VERIFY THE DTC IS ACTIVE

NOTE: If multiple DTCs are present, inspect the wiring and harness connector at the Air Suspension Compressor.

1. Ignition on, engine not running.
2. With the scan tool, record and erase the DTCs.
3. With the scan tool, read the DTCs.

Is the DTC Active at this time?

Yes

- Go To 2

No

- Go To 6

2. AIR SUSPENSION RELAY
1. Turn the ignition off to the lock position.
2. Install a known good relay
3. Ignition on, engine not running.
4. With the scan tool, erase the DTCs.
5. With the scan tool, read the DTCs.

Is the status still Active for this DTC?

Yes

- Go To 3

No

- Install a new Air Suspension Relay.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

3. (Y38) COMPRESSOR RELAY SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE




1. Turn the ignition off to the lock position.
2. Remove the Air Suspension Relay.
3. Disconnect the ASCM C2 harness connector.
4. Measure the resistance of the (Y38) Compressor Relay Signal circuit between the ASCM C2 harness connector and the Air Suspension Relay.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (Y38) Compressor Relay Signal circuit for an open or high resistance.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Go To 4

4. (Y39) AIR COMPRESSOR RELAY RETURN CIRCUIT OPEN OR HIGH RESISTANCE




1. Measure the resistance of the (Y39) Compressor Relay Return circuit between the ASCM C2 harness connector and the Air Suspension Relay.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (Y39) Compressor Relay Return circuit for an open or high resistance.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Go To 5

5. (Y39) AIR COMPRESSOR RELAY RETURN CIRCUIT SHORTED TO GROUND




1. Measure the resistance between ground and the (Y39) Air Compressor Relay Return circuit.

Is the resistance below 5.0 Ohms?

Yes

- Repair the (Y39) Compressor Relay Return circuit for a short to ground.
- 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 and connectors.
2. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
3. Look for the data to change or for the DTC to reset during the wiggle test.

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.