DTC B124C:56 [START STOP UNIT]

id0902p6020700

Description

Turn switch circuit malfunction
Detection condition
•  Start stop unit detects that the turn switch LH and RH are turned on simultaneously for 5 s or more.
Fail-safe function
Not applicable
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
Not applicable

Diagnostic Procedure

Step

Inspection

Action
1
PERFORM START STOP UNIT CONFIGURATION (USING AS-BUILT DATA)
•  Using the M-MDS, perform the start stop unit configuration (using As-Built data).
•  Clear the DTC for the start stop unit using the M-MDS.
•  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.
•  Retrieve the start stop unit DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Using the M-MDS, perform the start stop unit configuration (using As-Built data) again, then go to the next step.
(See START STOP UNIT CONFIGURATION (USING AS-BUILT DATA).)
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.
No
Install the light switch and the wiper and washer switch properly, then go to Step 4.
(See LIGHT SWITCH REMOVAL/INSTALLATION.)
(See WIPER AND WASHER SWITCH REMOVAL/INSTALLATION.)
3
INSPECT TURN SWITCH
•  Inspect the turn switch.
•  Is the turn switch normal?
Yes
Go to the next step.
No
Replace the light switch, then go to the next step.
(See LIGHT SWITCH REMOVAL/INSTALLATION.)
4
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Clear the DTC for the start stop unit using the M-MDS.
•  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.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the start stop unit.
Go to the next step.
No
Go to the next step.
5
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [START STOP UNIT].)
No
DTC troubleshooting completed.