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Sidelight, Number Plate, and/or Tail Lamps Malfunction

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

F6DR Fuse B+

B3867 01, B3867 04, B3949 01, B3949 04

B3867 01, B3867 04, B3949 01, B3949 04

--

--

Indicator/Multifunction Switch Sidelights ON Signal

2

B257A 00

2

--

Number Plate Lamp Control

B3883 02

B3883 01, B3883 04

B3883 01

--

Sidelights Control - Left Front

B2585 02

B2585 01, B2585 04

B2585 01, B2585 04

-

Sidelights Control - Right Front

B3867 02

B3867 01, B3867 04,

B3867 01, B3867 04,

-

Sidelights Control - Left Rear

1

1

1

--

Sidelights Control - Right Rear

1

1

1

--

Number Plate Lamp Ground - Right

--

1

--

--

Number Plate Lamp Ground - Left

--

1

--

--

Sidelight Ground - Left Front

-

B2585 01, B2585 04, B3948 01, B3948 04

--

--

Sidelight Ground - Right Front

-

B3867 01, B3867 04, B3949 01, B3949 04

--

--

Tail Lamp Ground - Left

--

1

--

--

Tail Lamp Ground - Right

--

1

--

--

Indicator/Multifunction Switch Ground

--

2

--

--

1. Sidelight, Number Plate, and/or Tail Lamps Malfunction

2. Sidelight Switch Malfunction

Circuit/System Description

When the indicator/multifunction switch is placed in the HEADLAMP or SIDELIGHT position, ground is applied to the sidelights ON signal circuit to the body control module (BCM). The BCM responds by applying voltage to the sidelights, tail lamps, and number plate lamps control circuits illuminating the sidelight, tail, and number plate lamps.

Reference Information

Schematic Reference

    •  Exterior Lamps Schematics
    •  Body Control System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Vehicle in Service Mode, observe the scan tool Sidelights Switch parameter while turning the indicator/multifunction switch between the OFF and SIDELIGHT positions. The parameter should change between Active and Inactive.
  2. If the parameter does not change between the commanded states, refer to Sidelight Switch Malfunction.
  3. Command the Left Front Sidelight ON and OFF with a scan tool. The left front sidelight should turn ON and OFF when changing between the commanded states.
  4. If the left front sidelight does not turn ON and OFF when commanded, refer to Sidelights Malfunction.
  5. Command the Left Rear Sidelight ON and OFF with a scan tool. The left rear sidelight should turn ON and OFF when changing between the commanded states.
  6. If the left rear sidelight does not turn ON and OFF when commanded, refer to Sidelights Malfunction.
  7. Command the Right Front Sidelight ON and OFF with a scan tool. The right front sidelight should turn ON and OFF when changing between the commanded states.
  8. If the right front sidelight does not turn ON and OFF when commanded, refer to Sidelights Malfunction.
  9. Command the Right Rear Sidelight ON and OFF with a scan tool. The right rear sidelight should turn ON and OFF when changing between the commanded states.
  10. If the right rear sidelight does not turn ON and OFF when commanded, refer to Sidelights Malfunction.
  11. Command the Number Plate Lamps ON and OFF with a scan tool. The number plate lamps should turn ON and OFF when changing between the commanded states.
  12. If the number plate lamps do not turn ON and OFF when commanded, refer to Number Plate Lamps Malfunction.

Circuit/System Testing

Sidelight Switch Malfunction

  1. Vehicle OFF, disconnect the harness connector at the S78 Indicator/Multifunction Switch.
  2. Vehicle OFF, all doors closed, all accessories OFF, and wait 2 minutes. Test for less than 10 Ω between the ground circuit terminal 6 and ground.
  3. If greater then the specified range, test the ground circuit for an open/high resistance.
  4. Vehicle in Service Mode, verify the scan tool Sidelights Switch parameter is Inactive.
  5. If not the specified value, test the signal circuit terminal 7 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
  6. Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground. Verify the scan tool Sidelights Switch parameter is Active.
  7. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  8. If all circuits test normal, replace the S78 Indicator/Multifunction Switch.

Sidelights Malfunction

  1. Vehicle OFF, disconnect the harness connector at the inoperative sidelight.
  2. Vehicle OFF, exterior lamps OFF, test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground:
  3. • E4N Sidelight/Indicator Lamp - Left - terminal 1
    • E4P Sidelight/Indicator Lamp - Right - terminal 1
    • E42L Tail Lamp Assembly - Left - terminal 4
    • E42R Tail Lamp Assembly - Right - terminal 4
    If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Connect a test lamp between the appropriate control circuit terminal listed below and ground:
  5. • E4N Sidelight/Indicator Lamp - Left - terminal 2
    • E4P Sidelight/Indicator Lamp - Right - terminal 2
    • E42L Tail Lamp Assembly - Left - terminal 2
    • E42R Tail Lamp Assembly - Right - terminal 2
  6. Vehicle in Service Mode, command the appropriate Sidelight ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  7. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
    If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  8. If all circuits test normal, replace the inoperative park lamp.

Number Plate Lamps Malfunction

  1. Vehicle OFF, disconnect the harness connector at the E7L Number Plate Lamp - Left and E7R Number Plate Lamp - Right.
  2. Vehicle OFF, exterior lamps OFF, test for less than 5 Ω between each ground circuit terminal 2 and ground.
  3. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Connect a test lamp between the E7L Number Plate Lamp - Left control circuit terminal 1 and ground.
  5. Vehicle in Service Mode, command the Number Plate Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
    If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  7. Vehicle OFF, connect a test lamp between the E7R Number Plate Lamp - Right control circuit terminal 1 and ground.
  8. Vehicle in Service Mode, command the Number Plate Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  9. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  10. If all circuits test normal, replace the inoperative number plate lamp bulb.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Rear Number Plate Lamp Replacement
    •  Tail Lamp Replacement
    •  Indicator Multifunction Switch Replacement
    •  Tail Lamp Replacement
    • Control Module References for BCM replacement, programming and setup
   


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