Circuit/System Testing

Ignition/Vehicle - Off
Disconnect the electrical connector:A16 Transfer Case Four Wheel Drive Actuator
Connect a test lamp between the test points:Control circuit terminal A & Control circuit terminal D
Ignition - On/Vehicle - In Service Mode
Perform the scan tool control function:Range Actuator
Verify the test lamp state:

Range Actuator - Idle = Test lamp Off

Range Actuator - Clockwise = Test lamp On

Range Actuator - Counterclockwise = Test lamp On
- If not the specified state
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Disconnect the electrical connector:X1@K69 Transfer Case Control Module
3. Ignition - On/Vehicle - In Service Mode
4. Test for less than 1 V between the test points:
  - Control circuit terminal A@Component harness & Ground
  - Control circuit terminal D@Component harness & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - Go to next step: If less than 1 V
5. Ignition/Vehicle - Off
6. Test for infinite resistance between the test points:
  - Control circuit terminal A@Component harness & Ground
  - Control circuit terminal D@Component harness & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
7. Test for less than 2 ohms between the test points:
  - Control circuit terminal A@Component harness & Terminal 38@Control module harness
  - Control circuit terminal D@Component harness & Terminal 13@Control module harness
    - If 2 ohms or greater - Repair the open/high resistance in the circuit.
    - If less than 2 ohms - Replace the component:K69 Transfer Case Control Module
- Go to next step: If the specified state
Verify a condition does not exist with the component:Transfer Case Assembly
- If a condition exists - Repair or replace as necessary
- Go to next step: If no condition exists
Test or replace the component:A16 Transfer Case Four Wheel Drive Actuator