Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 351 (LIGHTING SYSTEM - DIAGNOSIS)LIGHT AUTO TURN OFF SYSTEM LIGHT DOES NOT OPERATEINSPECTION PROCEDURE

2004 Toyota Celica GT, Standard

Inspection Procedure

2004 Toyota Celica GT, StandardSECTION Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE OF HAND-HELD TESTER
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main SW ON.
3. Select the item "IG SW" "ACC SW" in the DATA LIST and read its value displayed on the hand-held tester.
  OK:
  
  IG SW:
  - IG key is ON or START position --> ON
  - IG key is in OFF or ACC position --> OFF
  ACC SW:
  - IG key is in ACC, ON or START position --> ON
  - IG key is in OFF position --> OFF
  NG: REPLACE IGNITION OR STARTER SWITCH ASSY
  
  OK: Go to Next Step
READ VALUE OF HAND-HELD TESTER
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main SW ON.
3. Select the item "D DOOR CTY SW" in the DATA LIST and read its value displayed on the hand-held tester.
  OK:
  - Driver's door is open --> ON
  - Driver's door is close --> OFF
  NG: REPLACE FRONT DOOR COURTESY LAMP SWITCH ASSY
  
  OK: CHECK AND REPLACE DRIVER SIDE JUNCTION BLOCK ASSY

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.