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 MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 207 (MULTIPLEX COMMUNICATION SYSTEM)SELF-DIAGNOSTIC SYSTEMDIAGNOSTIC TROUBLE CODES

2004 Toyota Matrix XR, FWD, Standard

Diagnostic Trouble Codes

2004 Toyota Matrix XR, FWD, StandardSECTION Diagnostic Trouble Codes

WARNING: This page is about a different car, the 2003 Lexus IS 300 and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC TROUBLE CODE INDEX

DTC ⁽¹⁾

Description

B1211/11

Power Window Master Switch ECU Communication Stop

B1214/14 ⁽²⁾

Communication Bus Malfunction (+B Short)

B1215/15 ⁽²⁾

Communication Bus Malfunction (GND Short)

B1241/41

Body ECU Switch Circuit Diagnosis

B1242/42

Wireless Door Lock Tuner Circuit Malfunction

B1244/44

Light Sensor Circuit Malfunction

B1261/61

ECM Communication Stop

B1262/62

A/C ECU Communication Stop

B1269/69

Anti-Theft ECU Communication Stop

B1271 ⁽³⁾

Combination Meter ECU Communication Stop

⁽¹⁾	Four digit B codes are scan tool codes. Two digit codes are open door indicator light codes.

⁽²⁾	Output of DTC B1214/14 or B1215/15 indicates a short to voltage or short to ground has been identified. Other DTCs may also be output. Always repair DTC B1214/14 or B1215/15 first.

⁽³⁾	DTC B1271 cannot be output by the open door indicator light because the combination meter controls the open door indicator light.

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.