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Diagnosis Procedure
1.CHECK OUTPUT CIRCUIT
  1. Electric motor switch ON.
  2. Turn ON any switch in the system that is malfunctioning.
  3. Check duty ratios between BCM harness connector and ground by using an oscilloscope.
    System+−Output waveform
    BCM
    ConnectorTerminal
    Output 1M1948GroundRefer to Reference Value.
    Output 249
    Output 353
    Output 452
    Output 550
    Output 651
Is the inspection result normal?
Check intermittent incident. Refer to Intermittent IncidentIntermittent Incident.
-1Fixed to 0 V: .
-2Fixed to 9 – 16 V: Replace BCM. Refer to Removal and Installation.
 
2.CHECK OUTPUT CIRCUIT FOR OPEN
  1. Electric motor switch OFF.
  2. Disconnect BCM connector.
  3. Check continuity between BCM harness connector and combination switch harness connector.
    SystemBCMCombination switchContinuity
    ConnectorTerminalConnectorTerminal
    Output 1M1948M287Existed
    Output 24915
    Output 35310
    Output 4525
    Output 5502
    Output 65112
Is the inspection result normal?
.
Repair harnesses or connector.
 
3.CHECK OUTPUT CIRCUIT FOR SHORT
Check for continuity between BCM harness connector and ground.
SystemBCM—Continuity
ConnectorTerminal
Output 1M1948GroundNot existed
Output 249
Output 353
Output 452
Output 550
Output 651
Is the inspection result normal?
Replace combination switch. Refer to Removal and Installation.
Repair harnesses or connector.