C146A

C146A-FRONT AXLE DISCONNECT RETURN CONTROL CIRCUIT OPEN





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

- When Monitored:
The ignition on. T-Case Switch in 4W/LO position.

- Set Condition:
The TIPM detects that the Front Axle Lock Signal circuit is shorted low.





1. ACTIVE DTC

CAUTION: Before removing the TIPM harness connectors, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

1. Ignition on, engine not running.
2. With the scan tool, read the TIPM DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Go To 9

2. (A880) FUSED B+ OPEN




1. Turn the ignition off to the lock position.
2. Disconnect the FAD harness connector.
3. Ignition on, engine not running.
4. With the scan tool, actuate the Front Axle Lock Signal in the TIPM.
5. Using a 12-volt test light connected to ground, check the (A880) Front Axle Lock Signal circuit in the FAD harness connector.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the (A880) Fused B+ circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

3. (G304) FRONT AXLE LOCK CONTROL CIRCUIT




1. Using a 12-volt test light, jump across from the (A880) Fused B+ circuit and the G304 Front Axle Lock Control circuit in the FAD harness connector.
2. With the scan tool, actuate the Front Axle Lock in the TIPM.

Does the test light illuminate brightly and flash on and off?

Yes

- Go To 4

No

- Go To 6

4. (G303) FRONT AXLE LOCK SIGNAL CIRCUIT




1. Turn the ignition off to the lock position.
2. Connect the FAD harness connector.
3. Using a 12-volt test light connected to ground, backprobe the (G303) Front Axle Lock Signal circuit in the TIPM C4 harness connector.
4. Ignition on, engine not running.
5. With the scan tool, actuate the Front Axle Lock in the TIPM.

Does the test light illuminate brightly?

Yes

- Go To 8

No

- Go To 5

5. (G303) FRONT AXLE SIGNAL CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the FAD harness connector.
3. Disconnect the TIPM C4 harness connector.
4. Measure the resistance of the (G303) Front Axle Lock Signal circuit from the TIPM C4 harness connector to the FAD harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 7

No

- Repair the (G303) Front Axle Lock Signal for an open.
- Perform the TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

6. (G304) FRONT AXLE SIGNAL CIRCUIT OPEN




1. Turn the ignition off to the lock position.
2. Disconnect the TIPM C2 harness connector.
3. Measure the resistance of the (G304) Front Axle Lock Signal circuit from the TIPM C2 harness connector to the FAD harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 8

No

- Repair the (G304) Front Axle Lock Control for an open.
- Perform the TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

7. FRONT AXLE DISCONNECT (FAD) MODULE
1. Using the wiring diagram/schematic as a guide, inspect all wiring and connectors that pertain to this circuit.

Were any problems found?

Yes

- Repair as necessary.
- Perform the TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

No

- Replace the Front Axle Disconnect (FAD) Module.
- Perform the TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

8. TOTALLY INTEGRATED POWER MODULE (TIPM)
1. Using the wiring diagram/schematic as a guide, inspect all wiring and connectors that pertain to this circuit.

Were any problems found?

Yes

- Repair as necessary.
- Perform the TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

No

- Replace the Totally Integrated Power Module (TIPM).
- Perform the BODY VERIFICATION TEST Body Verification Test.

9. INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
4. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

No

- Test Complete.