Description

Light switch position signal error

Detection condition

• The BCM detected a light switch position signal error received from the start stop unit for 5 s or more with the ignition switched ON (engine off or on).

Fail-safe

Exterior lighting system

• Turn the TNS (parking lights) and headlights LO on, and turn off other exterior light controls.

Possible cause

• Start stop unit malfunction

• Light switch malfunction

• BCM malfunction

System wiring diagram

Not applicable

Step

Inspection

Action

1

• Clear the DTC for the BCM using the M-MDS.

  (See CLEARING DTC [BCM].)

• Switch the ignition ON (engine off or on) and wait for 5 s or more.

• Retrieve the BCM DTCs using the M-MDS.

  (See DTC INSPECTION [BCM].)

• Is the same DTC displayed?

Yes

Go to the next step.

No

Go to Step 6.

2

• Using the M-MDS, display the following PIDs for the start stop unit.

  (See PID/DATA MONITOR INSPECTION [START STOP UNIT].)

• H/L_SW_OFF

• H/L_SW_HI

• H/L_SW_LOW

• H/L_SW_TNS

• H/L_SW_PASS

• Does the PID monitoring value switch correctly according to the light switch operation?

Yes

Go to Step 4. (Circuit between light switch and start stop unit is normal.)

No

Go to the next step.

3

• Inspect the light switch.

  (See LIGHT SWITCH INSPECTION.)

• Is the light switch normal?

Yes

Replace the start stop unit, then go to Step 5.

(See START STOP UNIT REMOVAL/INSTALLATION.)

No

Replace the light switch, then go to Step 5.

(See LIGHT SWITCH REMOVAL/INSTALLATION.)

4

• Using the M-MDS, display the following PIDs for the BCM.

  (See PID/DATA MONITOR INSPECTION [BCM].)

• H/L_SW_OFF

• H/L_SW_HI

• H/L_SW_LOW

• H/L_SW_TNS

• H/L_SW_PASS

• Does the PID monitoring value switch correctly according to the light switch operation?

Yes

Go to the next step. (Circuit between start stop unit and BCM is normal)

No

Replace the start stop unit, then go to the next step.

(See START STOP UNIT REMOVAL/INSTALLATION.)

5

• Clear the DTC for the BCM using the M-MDS.

  (See CLEARING DTC [BCM].)

• Switch the ignition ON (engine off or on) and wait for 5 s or more.

• Retrieve the BCM DTCs using the M-MDS.

  (See DTC INSPECTION [BCM].)

• Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the BCM.

  (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

6

• Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [BCM].)

No

DTC troubleshooting completed.