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Circuit/System Testing

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Daytime Running Lamps Malfunction (W49 without CZ2)

  1. Ignition OFF, disconnect the KR42 Daytime Running Lamps Relay, ignition ON
  2. Verify a test lamp illuminates between the B+ circuit terminal 86 and ground.
    • If the test lamp does not illuminate 

      Replace the X51A Fuse Block - Instrument Panel.

    • If the test lamp illuminates 
  3. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
    • If the test lamp does not illuminate 

      Replace the X51A Fuse Block - Instrument Panel.

    • If the test lamp illuminates 
  4. Connect a test lamp between the control circuit terminal 85 and B+, ignition ON.
  5. Verify the test lamp turns ON and OFF when commanding the appropriate Daytime Running Lamp ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X5 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
    3. Ignition OFF.
    4. 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 X5 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the control circuit terminal and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If the test lamp turns ON and OFF 
  6. Ignition OFF, exterior lamps OFF, connect the KR42 Daytime Running Lamps Relay.
  7. Disconnect the harness connector at the appropriate E13 Headlamp Assembly.
  8. Test for less than 15 Ω between the appropriate ground circuit terminal listed below and ground.
    • Terminal 3 - without TSH
    • Terminal 4 - with TSH
    • 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.
    • If less than 15 Ω 
  9. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
    • Terminal 1 - without TSH
    • Terminal 2 - left daytime running lamp with TSH
    • Terminal 1 - right daytime running lamp with TSH
  10. Verify the test lamp turns ON and OFF when commanding the appropriate Daytime Running Lamp ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X1 harness connector at the X51A Fuse Block - Instrument Panel.
    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 KR42 Daytime Running Lamps Relay.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X1 harness connector at the X51A Fuse Block - Instrument Panel, 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 KR42 Daytime Running Lamp Relay.
    • If the test lamp turns ON and OFF 
  11. Test or replace the appropriate E4 Daytime Running Lamp.

Daytime Running Lamps Malfunction

  1. Ignition OFF, disconnect the appropriate KR42 Daytime Running Lamp Relay, ignition ON
  2. Verify a test lamp illuminates between the B+ circuit terminal 86 and ground.
    • If the test lamp does not illuminate 

      Replace the X51A Fuse Block - Instrument Panel.

    • If the test lamp illuminates 
  3. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
    • If the test lamp does not illuminate 

      Replace the X51A Fuse Block - Instrument Panel.

    • If the test lamp illuminates 
  4. Connect a test lamp between the control circuit terminal 85 and B+, ignition ON.
  5. Verify the test lamp turns ON and OFF when commanding the appropriate Daytime Running Lamp ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the appropriate harness connector listed below at the K9 Body Control Module, ignition ON.
      • X7 - left daytime running lamps
      • X4 - right daytime running lamps
    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
    3. Ignition OFF.
    4. 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 appropriate harness connector listed below at the K9 Body Control Module.
      • X7 - left daytime running lamps
      • X4 - right daytime running lamps
    2. Test for infinite resistance between the control circuit terminal and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If the test lamp turns ON and OFF 
  6. Ignition OFF, exterior lamps OFF, connect the appropriate KR42 Daytime Running Lamp Relay.
  7. Disconnect the harness connector at the appropriate E13 Headlamp Assembly.
  8. Test for less than 15 Ω between the ground circuit terminal 3 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.
    • If less than 15 Ω 
  9. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
    • Terminal 2 - left daytime running lamp (W49 with CZ2 and T97)
    • Terminal 1 - all RPO codes except W49 with CZ2 and T97
  10. Verify the test lamp turns ON and OFF when commanding the appropriate Daytime Running Lamp ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X1 harness connector at the X51A Fuse Block - Instrument Panel.
    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 KR42 Daytime Running Lamp Relay.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X1 harness connector at the X51A Fuse Block - Instrument Panel, 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 appropriate KR42 Daytime Running Lamp Relay.
    • If the test lamp turns ON and OFF 
  11. Test or replace the appropriate E4 Daytime Running Lamp.

Ambient Light/Sunload Sensor Malfunction

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the appropriate ambient light/sunload sensor. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground.
    • B10 Ambient Light Sensor - terminal B (C67)
    • B104 Sunload Sensor - terminal C (CJ2)
    • 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.
    • If less than 5 Ω 
  3. Ignition ON.
  4. Verify the scan tool Ambient Light Sensor parameter is greater than 4.65 V.
    • If 4.65 V or less 
    1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the appropriate signal circuit terminal listed below and ground.
      • B10 Ambient Light Sensor - terminal A (C67)
      • B104 Sunload Sensor - terminal D (CJ2)
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If greater than 4.65 V 
  5. Install a 3 A fused jumper wire between the appropriate signal circuit terminal listed below and ground.
    • B10 Ambient Light Sensor - terminal A (C67)
    • B104 Sunload Sensor - terminal D (CJ2)
  6. Verify the scan tool Ambient Light Sensor parameter is less than 0.196 V.
    • If 0.196 V or greater 
    1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the appropriate signal circuit terminal listed below and ground.
      • B10 Ambient Light Sensor - terminal A (C67)
      • B104 Sunload Sensor - terminal D (CJ2)
      • If 1 V or greater, repair the short to voltage on the circuit.
      • 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.
    • If less than 0.196 V 
  7. Test or replace the appropriate ambient light/sunload sensor.
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