BCM-Meter Signal Circuit Inspection
NOTE:- When BCM-Meter signal circuit is malfunction, combination meter indicates the following condition at the same time. Be sure to bear this mind when diagnosing trouble.
- Charge warning indicator keeps flashing
- DRL indicator keeps flashing
- Brake indicator keeps flashing
- Windshield washer level indicator keeps flashing
- "O/D OFF" indicator keeps flashing (H27 engine with A/T model only)
- "POWER" indicator keeps flashing (H27 engine with A/T model only)
- A/T selector position indicator turns OFF (H27 engine with A/T model only)
- If charging system warning indicator, DRL indicator, Brake indicator, washer level indicator, O/D OFF indicator (H27 engine with A/T model only), POWER indicator (H27 engine with A/T model only) and A/T selector position indicator (H27 engine with A/T model only) display abnormal condition of BCM-METER signal circuit described in "Description", perform the following procedure.
1. Check open, short to ground and short to power circuit of BCM-METER signal circuit wire harness ("YEL") between "G55-10" and "G11-8" terminals.
If OK, go to next step.
If found abnormal condition, repair circuit.
2. Substitute a known-good BCM, and check that related indicator lights come to good conditions.
If found abnormal condition, go to next step.
3. Substitute a known-good combination meter, and recheck that the above indicators and warning operate in normal.
Reference
PCM-BCM signal circuit
Measurement terminal CH1:
Oscilloscope setting
CH1: 5 V / DIV
TIME: 400 (micro) s / DIV
Measurement condition
- Ignition switch ON
- A/T shift selector is P position
- O/D is ON
- A/T mode is normal mode
BCM-METER signal circuit
Measurement terminal CH1:
Oscilloscope setting
CH1: 5 V / DIV
TIME: 400 (micro) s / DIV
Measurement condition
- Ignition switch ON
- Parking brake is applied
- Washer level switch is full position