C1408

C1408-TRANSFER CASE BRAKE CONTROL CIRCUIT HIGH





For a complete wiring diagram Refer to Diagrams/Electrical Electrical Diagrams


- When Monitored:

With the ignition on and no system undervoltage or overvoltage condition present.

- Set Condition:

The Totally Integrated Power Module (TIPM) detects voltage on the Transfer Case Brake circuit when the output is off.







Diagnostic Test


1. CHECK IF THE DTC IS ACTIVE

Start the engine and allow it to idle.

Move the Transfer Case Selector Switch to each position several times.

With the scan tool, read the TIPM DTCs.

Is the status Active for this DTC?

Yes

- Go to 2

No

- Go to 5


2. (T300) TRANSFER CASE BRAKE SIGNAL CIRCUIT SHORTED TO VOLTAGE





Turn the ignition off to the lock position.

Disconnect the Transfer Case Motor harness connector.

Disconnect the TIPM C1 harness connector.

Measure the voltage of the (T300) Transfer Case Motor Brake Signal circuit at the Transfer Case Motor harness connector.

Is there any voltage present?

Yes

- Repair the (T300) Transfer Case Motor Brake Signal circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests

No

- Go to 3


3. (T300) TRANSFER CASE BRAKE SIGNAL CIRCUIT SHORTED TO THE (F941) FUSED RUN/START RELAY OUTPUT CIRCUIT





Measure the resistance between the (T300) Transfer Case Brake Signal circuit and the (F941) Fused RUN/START Relay Output circuit at the Transfer Case Motor harness connector.

Is the resistance below 5.0 ohms?

Yes

- Repair the (T300) Transfer Case Brake Signal circuit for a short.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests

No

- Go to 4


4. TRANSFER CASE MOTOR BRAKE

Turn the ignition off to the lock position.

Reconnect the Transfer Case Motor harness connector.

Reconnect the TIPM C1 harness connector.

Ignition on, engine not running.

With the scan tool, clear TIPM DTCs.

With the scan tool, select View DTCs.

Does the DTC P1408-Transfer Case Brake Control Circuit High reset?

Yes

- Replace the Transfer Case Motor.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests

No

- Replace the Totally Integrated Power Module (TIPM).
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests


5. INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.

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 TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests

No

- Test complete.