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Interior Lights 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

Interior light Supply Voltage

1

1

--

--

Interior light Control

2

1

--

--

1. Interior light inoperative

2. Interior lights always ON

Circuit/System Description

Battery voltage is supplied at all times to the interior lights from the F1DA located in the I/P fuse block. The interior light can be turned ON in 2 different ways; when any door is opened and interior light switch. Inputs from the interior light switch and the door ajar switches are monitored by the I/P fuse block. When a door ajar switch is closed, and the interior light switch is turned to the DOOR position, the I/P fuse block supplies the ground for the courtesy lamps.

Circuit/System Verification

Observe the driver information centre while opening and closing each vehicle door and the liftgate. The driver information centre should display the door ajar/liftgate ajar message only when the door/liftgate is open.

⇒ If the driver information centre displays the door ajar/tailgate ajar message when a door or the tailgate is closed, refer to Door Ajar Indicator Malfunction .
⇒If the door ajar/tailgate is functioning normally, refer to Interior Light Circuit Malfunction.

Circuit/System Testing

Dome Lamp Switch Malfunction

  1. Ignition OFF, disconnect the wiring harness plug at the E36AH Interior light.
  2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the voltage supply circuit terminal 2 and the control circuit terminal 3.
  4. Open and Close any door. The test lamp should turn ON and OFF when changing between the door states.
    5. ⇒If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the X51A I/P Fuse Block.
    ⇒If the test lamp is always OFF, test the control circuit for a short circuit to voltage or open/high resistance. If the circuit tests normal, replace the X51A I/P Fuse Block.
  5. If all circuits test normal, test or replace the E36AH Interior light.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Interior Lamp Replacement
    •  Instrument Panel Wiring Harness Junction Block Replacement
   


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