Test 1

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 appropriate electrical connector:
- M74D Window Motor - Driver
- M74P Window Motor - Passenger
- M74LR Window Motor - Left Rear
- M74RR Window Motor - Right Rear
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: M74 Window Motor 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 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 Ω between the test points: M74 Window Motor B+ circuit terminal 2 @ Output terminal & Fuse
  - 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 2 & Ground
  - If less than infinite resistance» Repair the short to ground on the circuit.
  - If infinite resistance» Replace the component: M74 Window Motor
- If the test lamp turns On
Test or replace the component: M74 Window Motor