Circuit/System Testing

Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate E13 Headlamp Assembly. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between the ground circuit terminal 7 and ground.
- If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
  - 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.
- Go to next step: If less than 10 Ω
Ignition ON.
Verify a test lamp illuminates between the B+ ignition circuit terminal 6 and ground.
- If the test lamp does not illuminate
1. Ignition OFF, remove the F44UA fuse at the X50A Fuse Block - Underhood.
2. Test for infinite resistance between the B+ ignition circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
3. Test for less than 2 Ω in the B+ circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the X50A Fuse Block - Underhood.
- Go to next step: If the test lamp illuminates
Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S30 Headlamp Switch. It may take up to 2 min for all vehicle systems to power down.
Test for less than 15 Ω between the ground circuit terminal 8 and ground.
- If 15 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
  - 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.
- Go to next step: If less than 15 Ω
Ignition ON.
Verify a test lamp illuminates between the B+ ignition circuit terminal 4 and ground.
- If the test lamp does not illuminate
1. Ignition OFF, remove the F27UA fuse at the X50A Fuse Block - Underhood.
2. Test for infinite resistance between the B+ circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
3. Test for less than 2 Ω in the B+ circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the X50A Fuse Block - Underhood.
- Go to next step: If the test lamp illuminates
Ignition OFF, connect the harness connector at the S30 Headlamp Switch.
Ignition ON, exterior lights OFF.
Test the voltage between the control circuit terminal 8 at the E13 Headlamp Assembly harness connector and ground for each headlamp leveling switch position listed below.
- Headlamp leveling switch position 0 - 10 V - 11 V
- Headlamp leveling switch position 1 - 8.5 V - 9.9 V
- Headlamp leveling switch position 2 - 8 V - 9 V
- Headlamp leveling switch position 3 - 6 V - 7 V
- If less than the specified voltage range for each headlamp leveling switch position
1. Ignition OFF, disconnect the harness connector at the S30 Headlamp Switch.
2. Test for infinite resistance between the control circuit terminal 9 and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
3. Test for less than 2 Ω in the control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the S30 Headlamp Switch.
- If greater than the specified voltage range for each headlamp leveling switch position
1. Ignition OFF, disconnect the harness connector at the S30 Headlamp Switch, ignition ON.
2. Test for less than 1 V between the control circuit terminal 9 and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the S30 Headlamp Switch.
- Go to next step: If within the specified voltage range for each headlamp leveling switch position
Test or replace the E13 Headlamp Assembly.