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 421 (LEXUS LINK SYSTEM - DIAGNOSIS)
2004 Toyota Celica GT, Standard
Section 421 (LEXUS Link System - Diagnosis)
2004 Toyota Celica GT, StandardSECTION Section 421 (LEXUS Link System - Diagnosis)
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
- How To Proceed With Troubleshooting
- Customer Problem Analysis Check
- Pre-Check
- Diagnostic Trouble Code Chart
- Parts Location
- Terminals Of Ecu
- Problem Symptoms Table
- Circuit Inspection
- DTC 1 "CODE 1. GPS antenna failure"
- DTC 2 "CODE 2. Button module failure"
- DTC 3 "CODE 3. Transceiver failure"
- DTC 4 "CODE 4. Telephone ECU failure"
- DTC 5 "CODE 5. Back-up battery failure"
- DTC 6 "CODE 6. Loss of BEAN communication"
- The Guidance Voice Of "System Message" Does Not Come Out When Ignition Switch Is Turned On, The Guidance Voice Of "System Message" Intermittently Stop When Ignition Switch Is Turned On, The Guidance Voice Of "System Message" Begins In The Middle When Ignition Switch Is Turned On
- Malfunction in "Memo Call" function.
- The guidance voice of "Demo Memo" does not come out.
- When "Service Button" is working the connection to LEXUS Link Center cannot be made or is immediately cut off.
- While service call is working, voice cannot reach to LEXUS Link Center.
- After the connection to LEXUS Link Center, no voice comes out.
- The connection to LEXUS Link Center cannot be cut off.
- The line condition with LEXUS Link Center is not good.
- The uncontrolled service is sent., The uncontrolled emergency call is sent.
- Buck-up battery life is short.
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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.