Circuit/System Testing

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, exterior lamps OFF, remove the harness connector at the appropriate E4 Daytime Running Lamp. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between the appropriate ground circuit terminal listed below and ground.
- E4AC Park/Daytime Running Lamp - Left terminal 2 (T3N)
- E4AD Park/Daytime Running Lamp - Right terminal 2 (T3N)
- E13LA Headlamp Assembly - Left terminal 4 (T7E)
- E13RA Headlamp Assembly - Right terminal 4 (T7E)
- 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.
- If less than 10 Ω
Connect the harness connector at the appropriate E4 Daytime Running Lamp.
Disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
Test for less than 10 Ω between the appropriate ground circuit terminal listed below and ground.
- Terminal 30 - left daytime running lamp
- Terminal 18 - right daytime running lamp
- 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.
- If less than 10 Ω
Connect a 3 A fused jumper between the appropriate control circuit terminal listed below and B+.
- Terminal 6 - left daytime running lamp
- Terminal 2 - right daytime running lamp
Verify the appropriate E4 Daytime Running Lamp illuminates.
- If the daytime running lamp does not illuminate
1. Ignition OFF, remove the appropriate E4 Daytime Running Lamp.
2. Test for infinite resistance between the control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - 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 appropriate E4 Daytime Running Lamp.
- If the daytime running lamp illuminates
Ignition OFF, connect the X2 harness connector at the X50A Fuse Block - Underhood.
Disconnect the X5 harness connector at the K9 Body Control Module, ignition ON
Verify a test lamp does not illuminate between the appropriate control circuit terminal listed below and ground.
- Terminal 26 - left daytime running lamp
- Terminal 25 - right daytime running lamp
- If the test lamp illuminates
1. Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood, ignition ON.
2. Test for less than 1 V between the control circuit terminal and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the X50A Fuse Block - Underhood.
- If the test lamp does not illuminate
Ignition OFF, connect a 3 A fused jumper between the appropriate control circuit terminal listed below and B+, ignition ON.
- Terminal 26 - left daytime running lamp
- Terminal 25 - right daytime running lamp
Verify both daytime running lamps illuminate.
- If the daytime running lamps do not illuminate
1. Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
2. Test for infinite resistance between the control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - 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 X50A Fuse Block - Underhood.
- If the daytime running lamps illuminate
Test or replace the K9 Body Control Module.