Diagnosis Procedure
- CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR OPEN
- Turn the ignition switch OFF.
- Disconnect BCM connector M20 and combination switch connector M28.
- Check continuity between BCM harness connector M20 and combination switch harness connector M28.
Combination switch signal
BCM
Combination switch
Continuity
Connector
Terminal
Connector
Terminal
INPUT 1
M20
79
M28
11
Yes
INPUT 2
78
9
INPUT 3
77
7
INPUT 4
76
10
INPUT 5
75
13
Is the inspection result normal?
YES
GO TO 2
NO
Repair or replace harness.
- CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR SHORT
Check for continuity between BCM harness connector M20 and ground.
Combination switch signal
BCM
Ground
Continuity
Connector
Terminal
INPUT 1
M20
79
No
INPUT 2
78
INPUT 3
77
INPUT 4
76
INPUT 5
75
Is the inspection result normal?
YES
GO TO 3 .
NO
Repair or replace harness.
- CHECK BCM OUTPUT SIGNAL
- Connect BCM connector M20 and combination switch connector M28.
- Turn ON any switch in the system that is malfunctioning.
- Check voltage between BCM harness connector M20 and ground.
Combination switch signal
Terminals
Voltage
(Approx.)
(+)
(-)
BCM
Ground
Connector
Terminal
INPUT 1
M20
79
-
Refer to Reference Value .
INPUT 2
78
INPUT 3
77
INPUT 4
76
INPUT 5
75
Is the measurement normal when any of the switches is turned ON?
YES
Replace combination switch. Refer to Removal and Installation .
NO
Replace BCM. Refer to Removal and Installation .