C1407

C1407-TRANSFER CASE BRAKE CONTROL CIRCUIT LOW





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

- When Monitored:
With the ignition on and no system undervoltage or overvoltage condition present.

- Set Condition:
The Drive Train Control Module (DTCM) detects that the Transfer Case Motor Lock circuit diagnostic input is low when output is off.





1. DTC IS ACTIVE
1. Turn the ignition off to the lock position
2. With the scan tool, record and erase DTCs.
3. Start the engine and allow it to idle.
4. With the scan tool, read DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Go To 4

2. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT SHORTED TO GROUND




1. Turn the ignition off to the lock position
2. Disconnect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector.
3. Disconnect the DTCM C1 harness connector.
4. Measure the resistance between ground and the (T301) Switched Battery Solenoid Supply circuit.

Is the resistance below 5.0 Ohms?

Yes

- Repair the (T301) Switched Battery Solenoid Supply circuit for a short to ground.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Go To 3

3. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT VOLTAGE




1. Ignition on, engine not running.
2. Connect a 12-volt test light between the (T301) Switched Battery Solenoid Supply circuit and the (T317) Transfer Case Motor Lock Signal at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector.

NOTE: As a failsafe precaution when the Transfer Case Shift Motor/Mode Sensor Assembly harness connector is disconnected, the DTCs must be cleared in the DTCM. Failure to follow this will result in the DTCM detecting this condition and turning OFF the Switched Battery Solenoid Supply circuit.

3. Using the scan tool, erase DTCs.
4. With the scan tool, actuate the T-Case Motor Solenoid Lock in the DTCM.

NOTE: Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

- Replace the Transfer Case Shift Motor/Mode Sensor Assembly.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Replace the Drive Train Control Module (DTCM).
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

4. INTERMITTENT WIRING HARNESS AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors.
3. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
4. Look for the data to change or for the DTC to reset during the wiggle test.
5. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
6. 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 TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Test complete.