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)INITIAL SET CONTROL FUNCTION OPERATES, BUT HEADLAMP AIMING DOES NOT OPERATE (WARNING LAMP LIGHTS UP)INSPECTION 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.

CHECK HARNESS AND CONNECTOR (BETWEEN HEIGHT CONTROL SENSOR AND HEADLAMP LEVELING ECU)
1. Check the continuity of the vehicle side wire harness between headlamp leveling ECU and headlamp leveling motor.
  Standard: There is continuity.
  
  NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
  
  OK: Go to Next Step
INSPECT HEIGHT CONTROL SENSOR SUB-ASSY REAR RH
1. Connect 3 batteries (1.5V) in series.
2. Connect the battery positive terminal to terminal SHB, and the negative one to terminal SHG to apply the voltage of 4.5 V between terminals SHB and SHG.
3. While slowly moving the link up and down with the voltage being applied, check the voltage between terminals SHRR and SHG.
  
  Fig 1: Checking Voltage Between Terminals SHRR & SHG
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 2: Height Control Sensor Sub-Assy Rear RH Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NG: REPLACE HEIGHT CONTROL SENSOR SUB-ASSY REAR RH
  
  OK: CHECK AND REPLACE HEADLAMP LEVELING ECU ASSY

RENDER: 1.0x

NO RELATED

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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.