Circuit/System Testing

Ignition/Vehicle & All vehicle systems» Off
NOTE: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
Disconnect the electrical connector: S79D Window Switch - Driver
Test for less than 10 Ω between the test points: Ground circuit terminal 1 & Ground
- If 10 Ω or greater
1. Ground Connection» Disconnect
2. Test for less than 2 Ω between the test points: Ground circuit terminal 1 @ Component harness & Ground Connection
  - If 2 Ω or greater» Repair the open/high resistance in the circuit.
  - If less than 2 Ω» Repair the open/high resistance in the ground connection.
- If less than 10 Ω
Ignition» On / Vehicle» In Service Mode
Verify a test lamp turns On between the test points: B+ circuit terminal 4 & Ground
- If the test lamp does not turn On and the circuit fuse is OK
1. Ignition/Vehicle» Off & Remove» Test lamp
  - If 2 Ω or greater» Repair the open/high resistance in the circuit.
  - If less than 2 Ω» Verify the fuse is OK and there is voltage at the fuse.
- If the test lamp does not turn On and the circuit fuse is open
  1. Ignition/Vehicle » Off & Remove » Test lamp
  2. Test for infinite resistance between the test points: B+ circuit terminal 4 & Ground
    - If less than infinite resistance» Repair the short to ground on the circuit.
    - If infinite resistance» Replace the component: S79D Window Switch - Driver
- If the test lamp turns On
Verify the scan tool parameter: Driver Window Main Control Down Switch=Inactive
- If not the specified state
1. Ignition/Vehicle » Off
2. Disconnect the electrical connector: M74D Window Motor - Driver
3. Test for infinite resistance between the test points: Signal circuit terminal 3 @ Component harness & Ground
  - If less than infinite resistance» Repair the short to ground on the circuit.
  - If infinite resistance» Replace the component: M74D Window Motor - Driver
- If the specified state
Momentarily connect a 3A fused jumper wire between the test points: Signal circuit terminal 3 & Ground circuit terminal 1
Verify the scan tool parameter: Driver Window Main Control Down Switch=Active
- If not the specified state
1. Ignition/Vehicle » Off & Remove» Jumper wire(s)
2. Disconnect the electrical connector: M74D Window Motor - Driver
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points: Signal circuit terminal 3 @ Component harness & Ground
  - If 1 V or greater» Repair the short to voltage on the circuit.
  - If less than 1 V
5. Ignition/Vehicle» Off
6. Test for less than 2 Ω between the test points: Signal circuit terminal 3 @ Component harness & Signal circuit terminal 7 @ M74D Window Motor - Driver
  - If 2 Ω or greater» Repair the open/high resistance in the circuit.
  - If less than 2 Ω» Replace the component: M74D Window Motor - Driver
- If the specified state
Verify the scan tool parameter: Driver Window Main Control Up Switch=Inactive
- If not the specified state
1. Ignition/Vehicle» Off
2. Disconnect the electrical connector: M74D Window Motor - Driver
3. Test for infinite resistance between the test points: Signal circuit terminal 6 @ Component harness & Ground
  - If less than infinite resistance» Repair the short to ground on the circuit.
  - If infinite resistance» Replace the component: M74D Window Motor - Driver
- If the specified state
Momentarily connect a 3 A fused jumper wire between the test points: Signal circuit terminal 6 & Ground circuit terminal 1
Verify the scan tool parameter: Driver Window Main Control Up Switch=Active
- If not the specified state
1. Ignition/Vehicle» Off & Remove» Jumper wire(s)
2. Disconnect the electrical connector: M74D Window Motor - Driver
3. Ignition» On / Vehicle» In Service Mode
4. Test for less than 1 V between the test points: Signal circuit terminal 6 @ Component harness & Ground
  - If 1 V or greater» Repair the short to voltage on the circuit.
  - If less than 1 V
5. Ignition/Vehicle» Off
6. Test for less than 2 Ω between the test points: Signal circuit terminal 6 @ Component harness & Signal circuit terminal 3 @ M74D Window Motor - Driver
  - If 2 Ω or greater» Repair the open/high resistance in the circuit.
  - If less than 2 Ω» Replace the component: M74D Window Motor - Driver
- If the specified state
Verify the scan tool parameter: Driver Window Main Control Express Switch=Inactive
- If not the specified state
1. Ignition/Vehicle» Off
2. Disconnect the electrical connector: M74D Window Motor - Driver
3. Test for infinite resistance between the test points: Signal circuit terminal 2 @ Component harness & Ground
  - If less than infinite resistance» Repair the short to ground on the circuit.
  - If infinite resistance» Replace the component: M74D Window Motor - Driver
- If the specified state
Momentarily connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Ground circuit terminal 1
Verify the scan tool parameter: Driver Window Main Control Express Switch=Active
- If not the specified state
1. Ignition/Vehicle» Off & Remove» Jumper wire(s)
2. Disconnect the electrical connector: M74D Window Motor - Driver
3. Ignition» On / Vehicle» In Service Mode
4. Test for less than 1 V between the test points: Signal circuit terminal 2 @ Component harness & Ground
  - If 1 V or greater» Repair the short to voltage on the circuit.
  - If less than 1 V
5. Ignition/Vehicle» Off
6. Test for less than 2 Ω between the test points: Signal circuit terminal 2 @ Component harness & Signal circuit terminal 5 @ M74D Window Motor - Driver
  - If 2 Ω or greater» Repair the open/high resistance in the circuit.
  - If less than 2 Ω» Replace the component: M74D Window Motor - Driver
- If the specified state
Test or replace the component: S79D Window Switch - Driver