• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provide an overview of each diagnostic category.

When the rear differential clutch control module receives a request to engage the rear differential, it will command the power transfer unit clutch motor to activate providing the operator with all wheel drive

The engine is running.

The rear differential clutch control module has detected that the power transfer unit clutch motor does not activate when commanded.

• The electronic limited slip control is disabled.
• The AWD SERVICE message is displayed in the driver information center.

• The condition for the DTC is no longer present.
• The DTC is not detected in 40 consecutive ignition cycles.

Rear Axle Schematics

Master Electrical Component List

Rear Drive Axle Description and Operation

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References for scan tool information

1. Ignition OFF, disconnect the X1 harness connector at the K47 Rear Differential Clutch Control Module, ignition ON/Vehicle in Service Mode.
2. Test for less than 1 V between the K47 Rear Differential Clutch Control Module harness connector terminals listed below and ground.
• Terminal 1
• Terminal 12
• If 1 V or greater

  Repair the short to voltage on the circuit.

• If less than 1 V
3. Ignition OFF.
4. Test for infinite resistance between K47 Rear Differential Clutch Control Module harness connector terminals listed below and ground.
• Terminal 1
• Terminal 12
• If less than infinite resistance

  Repair the short to ground on the circuit.

• If Infinite resistance
5. Disconnect the X1 harness connector at the M115 Power Transfer Unit Shift Actuator.
6. Test for less than 2 Ω between M115 Power Transfer Unit Shift Actuator harness connector terminal 1 and K47 Rear Differential Clutch Control Module harness connector terminal 1 end to end.
• If 2 Ω or greater

  Repair the open/high resistance in the circuit.

• If less than 2 Ω
7. Test for less than 2 Ω between M115 Power Transfer Unit Shift Actuator harness connector terminal 2 and K47 Rear Differential Clutch Control Module harness connector terminal 12 end to end.
• If 2 Ω or greater

  Repair the open/high resistance in the circuit.

• If less than 2 Ω

Note: DTC C1295 may set due to a mechanical issue within the power transfer unit in which the unit is not physically engaging, despite being commanded to do so.

8. Visually inspect the power transfer unit for any signs of mechanical damage or other conditions which may prevent the unit from physically engaging. This may require disassembly of the power transfer unit.
• If damage is found

  Repair as necessary.

• If no damage is found
9. Test or replace the M115 Power Transfer Unit Shift Actuator.
10. Operate the vehicle under the conditions for setting the DTC, the DTC should not set.
• If the DTC sets

  Replace the K47 Rear Differential Clutch Control Module.

• If no DTC sets
11. All OK

1. Ignition OFF, disconnect the X1 harness connector at the M115 Power Transfer Unit Shift Actuator.
2. Install a 20 A fused jumper wire between the control terminal 2 and 12 V. Install a jumper wire between the low reference terminal 1 and ground.
3. Verify the power transfer unit clutch motor turns ON and OFF
• If the power transfer unit clutch motor does not turn ON and OFF

  Replace the M115 Power Transfer Unit Shift Actuator.

• If the power transfer unit clutch motor does turn ON and OFF
4. All OK

Perform the Diagnostic Repair Verification after completing the repair.

• Power Transfer Unit Case Replacement for M115 Power Transfer Unit Shift Actuator.
• Control Module References for rear differential clutch control module replacement, programming, and setup.