Circuit/System Testing

Ignition/Vehicle Off
Disconnect the electrical connector: X2 K33 HVAC Control Module
Connect a test lamp between the test points: Control terminal 17 X2 & Ground
Engine Running
Verify the test lamp does not turn On.
- If the test lamp turns On
1. Ignition/Vehicle Off
2. Disconnect the electrical connector: X1 K9 Body Control Module
3. Ignition On/Vehicle In Service Mode
4. Test for less than 1 V between the test points: Control terminal 17 X2 & Ground
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the component: K9 Body Control Module
- If the test lamp does not turn On
Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 15 X2 & Ground
Verify the test lamp turns On.
- If the test lamp does not turn On
1. Ignition/Vehicle Off
2. Disconnect the electrical connector: X1 K9 Body Control Module
3. Test for infinite resistance between the test points: Control terminal 17 X2 @ Control module harness & Ground
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
4. Ignition/Vehicle Off
5. Test for less than 2 Ω between the test points: Control terminal 17 X2 @ Component harness & Terminal 23 X1 @ Control module harness
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω replace the component: K9 Body Control Module
- If the component is On
Replace the component: K33 HVAC Control Module