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Circuit/System Testing

Test 1

    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.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the appropriate electrical connector:
    • M74D Window Motor - Driver
    • M74P Window Motor - Passenger
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 1 & Ground
    • If 10 Ohms Or Greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 1@Component harness & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go To Next Step: If Less Than 10 Ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify a test lamp turns On between the test points: B+ circuit terminal 2 & Ground
    • If The Test Lamp Does Not Turn On And The Circuit Fuse Is Ok 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points: B+ circuit terminal 2@Output terminal & Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - 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 2 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:
    • M74D Window Motor - Driver
    • M74P Window Motor - Passenger
    • Go To Next Step: If The Test Lamp Turns On 
  6. Test or replace the component: M74D Window Motor - Driver/M74P Window Motor - Passenger

Test 2

    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.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: S79D Window Switch - Driver
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 1 & Ground
    • If 10 Ohms Or Greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 1@Component harness & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go To Next Step: If Less Than 10 Ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. 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 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - 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
    • Go To Next Step: If The Test Lamp Turns On 
  6. 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
    • Go To Next Step: If The Specified State 
  7. Momentarily connect a 3 A 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.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Signal circuit terminal 3@Component harness & Signal circuit terminal 7@M74D Window Motor - Driver
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: M74D Window Motor - Driver
    • Go to next step: If the specified state 
  8. 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
    • Go To Next Step: If The Specified State 
  9. 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.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Signal circuit terminal 6@Component harness & Signal circuit terminal 3@M74D Window Motor - Driver
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: M74D Window Motor - Driver
    • Go To Next Step: If The Specified State 
  10. 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
    • Go To Next Step: If The Specified State 
  11. 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.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Signal circuit terminal 2@Component harness & Signal circuit terminal 5@M74D Window Motor - Driver
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: M74D Window Motor - Driver
    • Go To Next Step: If The Specified State 
  12. Test or replace the component: S79D Window Switch - Driver

Test 3

    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.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: S79P Window Switch - Passenger
  3. Test for less than 10 ohms between the test points:
    • { Without AAB }Ground circuit terminal 1 & Ground
    • { With AAB }Ground circuit terminal 10 & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points:
      • { Without AAB }Ground circuit terminal 1@Component harness & Ground Connection
      • { With AAB }Ground circuit terminal 10@Component harness & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go To Next Step: If Less Than 10 Ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify the scan tool parameter: Passenger Window Switch at Door = Inactive
    • If Not The Specified State 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: M74P Window Motor - Passenger
    3. Test for infinite resistance between the test points:
      • { With AAB }Signal circuit terminal 4@Component harness & Ground
      • { With AAB }Signal circuit terminal 6@Component harness & Ground
      • { Without AAB }Signal circuit terminal 7@Component harness & Ground
      • { Without AAB }Signal circuit terminal 8@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: M74P Window Motor - Passenger
    • Go To Next Step: If The Specified State 
  6. Momentarily connect a 3 A fused jumper wire between the test points:
    • { With AAB }Signal circuit terminal 4@Component harness & Ground
    • { Without AAB }Signal circuit terminal 8@Component harness & Ground
  7. Verify the scan tool parameter: Passenger Window Switch at Door = Up
    • If Not The Specified State 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: M74P Window Motor - Passenger
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:
      • { With AAB }Signal circuit terminal 4@Component harness & Ground
      • { Without AAB }Signal circuit terminal 8@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 less than 2 ohms between the test points:
      • { With AAB }Signal circuit terminal 4@Component harness & Signal circuit terminal 3@M74P Window Motor - Passenger
      • { Without AAB }Signal circuit terminal 8@Component harness & Signal circuit terminal 3@M74P Window Motor - Passenger
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: M74P Window Motor - Passenger
    • Go To Next Step: If The Specified State 
  8. Momentarily connect a 3 A fused jumper wire between the test points:
    • { With AAB }Signal circuit terminal 6@Component harness & Ground
    • { Without AAB }Signal circuit terminal 7@Component harness & Ground
  9. Verify the scan tool parameter: Passenger Window Switch at Door = Down
    • If Not The Specified State 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: M74P Window Motor - Passenger
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:
      • { With AAB }Signal circuit terminal 6@Component harness & Ground
      • { Without AAB }Signal circuit terminal 7@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 less than 2 ohms between the test points:
      • { With AAB }Signal circuit terminal 6@Component harness & Signal circuit terminal 7@M74P Window Motor - Passenger
      • { Without AAB }Signal circuit terminal 7@Component harness & Signal circuit terminal 7@M74P Window Motor - Passenger
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: M74P Window Motor - Passenger
    • Go To Next Step: If The Specified State 
  10. Test for greater than 10 V between the test points:
    • { With AAB }Signal circuit terminal 5@Component harness & Ground
    • { Without AAB }Signal circuit terminal 6@Component harness & Ground
    • If 10 V Or Less 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: M74P Window Motor - Passenger
    3. Test for infinite resistance between the test points:
      • { With AAB }Signal circuit terminal 5@Component harness & Ground
      • { Without AAB }Signal circuit terminal 6@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If less than infinite resistance
    1. Test for less than 2 ohms between the test points:
      • { With AAB }Signal circuit terminal 5@Component harness & Signal circuit terminal 5@ M74P Window Motor - Passenger
      • { Without AAB }Signal circuit terminal 6@Component harness & Signal circuit terminal 5@ M74P Window Motor - Passenger
        • If 2 ohms or greater - Repair the open/high resistance in the circuit.
        • If less than 2 ohms - Replace the component: M74P Window Motor - Passenger
    • Go To Next Step: If The Specified State 
  11. Test or replace the component: S79P Window Switch - Passenger
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