DTC B124C:56 [START STOP UNIT]

id0902p6020700

System malfunction location

Turn switch circuit malfunction

Detection condition

•  The start stop unit detects that turn switches LH and RH are turned on simultaneously for 5 s or more.

Fail-safe

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Possible cause

•  Start stop unit configuration error

•  The installations of the light switch and the wiper and washer switch are reversed.

•  Turn switch malfunction

•  Start stop unit malfunction

System wiring diagram

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System malfunction location	Turn switch circuit malfunction
Detection condition	• The start stop unit detects that turn switches LH and RH are turned on simultaneously for 5 s or more.
Fail-safe	—
Possible cause	• Start stop unit configuration error • The installations of the light switch and the wiper and washer switch are reversed. • Turn switch malfunction • Start stop unit malfunction
System wiring diagram	—

Diagnostic Procedure

Step	Inspection		Action
1	PERFORM START STOP UNIT CONFIGURATION (AS-BUILT DATA USE) • Perform the start stop unit configuration using the M-MDS. (See START STOP UNIT CONFIGURATION (USING AS-BUILT DATA).) • Clear start stop unit DTCs using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Operate the turn switch to RH position and wait for 5 s or more. • Operate the turn switch to LH position and wait for 5 s or more. • Perform the DTC inspection for the start stop unit using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is DTC B124C:56 displayed?	Yes	Using the M-MDS, re-perform the start stop unit configuration using the As-Built data, then go to the next step. (See START STOP UNIT CONFIGURATION (USING AS-BUILT DATA).)
1		No	Go to Step 5.
2	VERIFY IF INSTALLATIONS OF LIGHT SWITCH AND WIPER AND WASHER SWITCH ARE REVERSED • Verify the installation condition of the light switch and the wiper and washer switch. • Are the light switch and the wiper and washer switch installed correctly?	Yes	Go to the next step.
2		No	Install the light switch and the wiper and washer switch properly, then go to Step 4.
3	INSPECT TURN SWITCH • Inspect the turn switch. (See LIGHT SWITCH INSPECTION.) • Is the turn switch normal?	Yes	Go to the next step.
3		No	Replace the turn switch, then go to the next step. (See LIGHT SWITCH REMOVAL/INSTALLATION.)
4	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Clear start stop unit DTCs using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Operate the turn switch to RH position and wait for 5 s or more. • Operate the turn switch to LH position and wait for 5 s or more. • Perform the start stop unit DTC inspection using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is DTC B124C:56 displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the start stop unit, then go to the next step. (See START STOP UNIT REMOVAL/INSTALLATION.)
4		No	Go to the next step.
5	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [START STOP UNIT].)
5		No	DTC troubleshooting completed.