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Circuit/System Testing

Headlamp Switch Malfunction

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, open and close drivers door, disconnect the harness connector at the S30 Headlamp Switch. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 8 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 
  3. Ignition ON.
  4. Verify the scan tool Park Lamps Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal 5 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • Go to next step: If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and ground.
  6. Verify the scan tool Park Lamps Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 5 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: If Active 
  7. Test or replace the S30 Headlamp Switch.

Park Lamps Malfunction

  1. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate component listed below. It may take up to 2 min for all vehicle systems to power down.
    • E4AC Park/Daytime Running Lamp - Left (X88)
    • E13LA Headlamp Assembly - Left (W49)
    • E13LA Headlamp Assembly - Left (T4L)
    • E2LF Side Marker Lamp - Left Front
    • E5G Tail Lamp - Left Inner
    • E5AK Tail Lamp - Left Outer
    • E4AD Park/Daytime Running Lamp - Right (X88)
    • E13RA Headlamp Assembly - Right (W49)
    • E13RA Headlamp Assembly - Right (T4L)
    • E2RF Side Marker Lamp - Right Front
    • E5H Tail Lamp - Right Inner
    • E5AL Tail Lamp - Right Outer
  2. Test for less than 10 Ω between the appropriate ground circuit terminal listed below and ground.
    • E4AC Park/Daytime Running Lamp - Left socket terminal (X88)
    • E13LA Headlamp Assembly - Left terminal 6 (W49)
    • E13LA Headlamp Assembly - Left terminal 4 (T4L)
    • E2LF Side Marker Lamp - Left Front terminal 1
    • E5G Tail Lamp - Left Inner terminal 1 (X88)
    • E5G Tail Lamp - Left Inner terminal 3 (W49)
    • E5AK Tail Lamp - Left Outer terminal 6 (X88)
    • E5AK Tail Lamp - Left Outer terminal 4 (W49)
    • E4AD Park/Daytime Running Lamp - Right socket terminal (X88)
    • E13RA Headlamp Assembly - Right terminal 6 (W49)
    • E13RA Headlamp Assembly - Right terminal 4 (T4L)
    • E2RF Side Marker Lamp - Right Front terminal 1
    • E5H Tail Lamp - Right Inner terminal 1 (X88)
    • E5H Tail Lamp - Right Inner terminal 3 (W49)
    • E5AL Tail Lamp - Right Outer terminal 6 (X88)
    • E5AL Tail Lamp - Right Outer terminal 4 (W49)
    • 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 
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
    • E4AC Park/Daytime Running Lamp - Left socket terminal (X88)
    • E13LA Headlamp Assembly - Left terminal 4 (W49)
    • E13LA Headlamp Assembly - Left terminal 6 (T4L)
    • E2LF Side Marker Lamp - Left Front terminal 2
    • E5G Tail Lamp - Left Inner terminal 2 (X88)
    • E5G Tail Lamp - Left Inner terminal 1 (W49)
    • E5AK Tail Lamp - Left Outer terminal 5 (X88)
    • E5AK Tail Lamp - Left Outer terminal 2 (W49)
    • E4AD Park/Daytime Running Lamp - Right socket terminal (X88)
    • E13RA Headlamp Assembly - Right terminal 4 (W49)
    • E13RA Headlamp Assembly - Right terminal 6 (T4L)
    • E2RF Side Marker Lamp - Right Front terminal 2
    • E5H Tail Lamp - Right Inner terminal 2 (X88)
    • E5H Tail Lamp - Right Inner terminal 1 (W49)
    • E5AL Tail Lamp - Right Outer terminal 5 (X88)
    • E5AL Tail Lamp - Right Outer terminal 2 (W49)
  4. Verify the test lamp turns ON and OFF when commanding the appropriate Park Lamps ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the control 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 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 K9 Body Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, 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 K9 Body Control Module.
    • Go to next step: If the test lamp turns ON and OFF 
  5. Test or replace the inoperative park lamp.

License Plate Lamps Malfunction

  1. Ignition OFF, exterior lamps OFF, remove both E7 License Plate Lamp bulbs. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 5 Ω between each ground circuit terminal listed below and ground.
    • E7L License Plate Lamp - Left terminal 1 (-DRZ)
    • E7L License Plate Lamp - Left terminal 2 (DRZ)
    • E7R License Plate Lamp - Right terminal 1 (-DRZ)
    • E7R License Plate Lamp - Right terminal 2 (DRZ)
    • If 5 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 5 Ω 
  3. Connect a test lamp between the appropriate E7L License Plate Lamp - Left control circuit terminal listed below and ground, ignition ON.
    • Terminal 2 (-DRZ)
    • Terminal 1 (DRZ)
  4. Verify the test lamp turns ON and OFF when commanding the License Plate Lamps ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the control 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 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 K9 Body Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, 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 K9 Body Control Module.
    • Go to next step: If the test lamp turns ON and OFF 
  5. Ignition OFF.
  6. Connect a test lamp between the appropriate E7R License Plate Lamp - Right control circuit terminal listed below and ground, ignition ON.
    • Terminal 2 (-DRZ)
    • Terminal 1 (DRZ)
  7. Verify the test lamp turns ON and OFF when commanding the License Plate Lamps ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the control 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 control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • Go to next step: If the test lamp turns ON and OFF 
  8. Test or replace the E7 License Plate Lamp bulb.
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