C1417–FRONT DIFFERENTIAL CONTROL CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

When Monitored:
Ignition on. Front Axle Lock engaged.
Set Condition:
The TIPM detects the Front Locker Control circuit is shorted low.

Possible Causes

(A104) FUSED B+ CIRCUIT OPEN OR SHORTED TO GROUND

(G304) FRONT LOCKER RELAY CONTROL CIRCUIT SHORTED TO GROUND

(G304) FRONT LOCKER RELAY CONTROL CIRCUIT OPEN

FRONT LOCKER (OFF-ROAD) RELAY

FRONT LOCKER SOLENOID

TOTALLY INTEGRATED CONTROL MODULE (TIPM)

Diagnostic Test

1. ACTIVE DTC

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

Is the DTC active at this time?

Yes

Go To 2

Go To8

2. FRONT LOCKER SOLENOID OPERATION

NOTE: Before continuing with the below diagnostic test, ensure the TIPM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off.
Disconnect the Front Locker Solenoid harness connector.
Ignition on, engine not running.
Using a 12-volt test light, jump across from the (T520) Front Locker Relay Output circuit and the (Z905) Ground circuit in the Front Locker harness connector.
With the scan tool, actuate the Front Locker Solenoid.

Does the test light illuminate and flash on and off?

Yes

Inspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Front Locker Solenoid in accordance with the Service Manual.

Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Go To 3

3. FRONT LOCKER (OFF ROAD) RELAY

Turn the ignition off.
Verify the Front Locker (OFF-ROAD) Relay is installed properly and that the terminals are making a tight fit.
Remove the Front Locker (OFF-ROAD) Relay and substitute it with a known good Relay.
Ignition on, engine not running.
Using a 12-volt test light, jump across from the (T520) Front Locker Relay Output circuit and the (Z905) Ground circuit in the Front Locker harness connector.
With the scan tool, actuate the Front Locker Solenoid.

Does the test light illuminate and flash on and off?

Yes

Replace the Front Locker (OFF-ROAD) Relay.

Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Go To 4

4. (A104) FUSED B+ FOR VOLTAGE

Turn the ignition off.
Remove the Front Locker (OFF-ROAD) Relay.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, check the (A104) Fused B+ circuit in the Front Locker (OFF-ROAD) relay connection.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

Go To 5

Repair (A104) Fused B+ circuit for an open or a short to ground.
Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

5. (G304) FRONT LOCKER RELAY CONTROL CIRCUIT SHORT TO GROUND

Turn the ignition off.
Disconnect the C2 TIPM harness connector.
Measure the resistance between ground and the (G304) Front Locker Relay Control circuit at the relay connection.

Is the resistance below 100 ohms?

Yes

Repair the (G304) Front Locker Relay Control circuit for a short to ground.

Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Go To 6

6. (G304) FRONT LOCKER RELAY CONTROL CIRCUIT OPEN

Measure the resistance of the (G304) Front Locker Relay Control circuit between the TIPM C1 harness connector and the Front Locker (OFF-ROAD) relay connection.

Is the resistance below 5.0 ohms?

Yes

Repair (G304) Front Locker Relay Control circuit for an open.

Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Go To 7

7. TOTALLY INTEGRATED POWER MODULE (TIPM)

NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes

Repair as necessary.

Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Replace and program the TIPM in accordance with Service Information.
Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

8. INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
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 TIPM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Test Complete.