C1408

C1408-TRANSFER CASE BRAKE CONTROL CIRCUIT HIGH





- When Monitored:
With the ignition on and no undervoltage or overvoltage condition present.
- Set Condition:
The Final Drive Control Module detects that the Transfer Case Motor Lock Circuit diagnostic input is high when the output is on.

Possible Causes
(T317) TRANSFER CASE MOTOR LOCK SIGNAL CIRCUIT SHORTED TO VOLTAGE
(T317) TRANSFER CASE MOTOR LOCK SIGNAL CIRCUIT SHORTED TO THE (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT
TRANSFER CASE MOTOR ASSEMBLY
FINAL DRIVE CONTROL MODULE

Diagnostic Test
1. DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, clear DTCs in the Final Drive Control Module.
Move the Shift control to each position.
With the scan tool, read DTCs in the Final Drive Control Module.
Does the DTC reset?
Yes >>Go to 2
No >>Go to 5





2. (T317) TRANSFER CASE MOTOR LOCK SIGNAL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off to the lock position.
Disconnect the Transfer Case Motor harness connector.
Disconnect the Final Drive Control Module C1 harness connector.
Ignition on, engine not running.
Measure the voltage of the (T317) Transfer Case Motor Lock Signal circuit.
Is there any voltage present?
Yes >>Repair the (T317) Transfer Case Motor Lock Signal circuit for a short to voltage. Perform the TRANSFER CASE VERIFICATION TEST-VER 1 Transfer Case Verification Test
No >>Go to 3





3. (T317) TRANSFER CASE MOTOR LOCK SIGNAL CIRCUIT SHORTED TO THE (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT
Measure the resistance between the (T317) Transfer Case Motor Lock Signal circuit and the (T301) Switched Battery Solenoid Supply circuit in the Transfer Case Motor harness connector.
Is the resistance below 5.0 ohms?
Yes >>Repair the (T317) Transfer Case Motor Lock Signal circuit for a short to the (T301) Switched Battery Solenoid Supply circuit. Perform the TRANSFER CASE VERIFICATION TEST-VER 1 Transfer Case Verification Test
No >>Go to 4

4. TRANSFER CASE MOTOR
Turn the ignition off to the lock position.
Connect the Final Drive Control Module C1 harness connector.
Ignition on, engine not running.
With the scan tool, clear the DTCs.
With the scan tool, read the DTCs in the Final Drive Control Module.
Does the DTC P11408-Transfer Case Brake Control Circuit High set?
Yes >>Replace the Transfer Case Motor assembly.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 Transfer Case Verification Test
No >>Replace the Final Drive Control Module.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 Transfer Case Verification Test

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 Transfer Case Verification Test
No >>Test complete.