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.
Radio Receiver Power Source Circuit: Procedure
- INSPECT FUSE (D MPX-B2, P-ACC)
- Disconnect the D MPX-B2 fuse from the main body ECU.
- Disconnect the P-ACC fuse from the passenger side junction block.
- Measure the resistance of the fuses.
Standard resistance
Tester Connection Condition Specified Condition D MPX-B2 fuse Always Below 1 Ω P-ACC fuse Always Below 1 Ω
NG → REPLACE FUSE
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - BATTERY AND BODY GROUND)
- Disconnect the L51 receiver connector.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
Tester Connection Switch Condition Specified Condition L51-1 (B) - Body ground Always 11 to 14 V L51-11 (ACC) - Body ground Engine switch on (ACC) 11 to 14 V - Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Condition Specified Condition L51-20 (GND) - Body ground Always Below 1 Ω
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → See step 3
- PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE
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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.
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