VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1531 BLS OFF STUCK
DTC detecting condition:
Defective stop light switch
Trouble symptom:
• ABS does not operate.
• VDC does not operate.
• Hill start assist does not operate.
WIRING DIAGRAM:
Vehicle dynamics control system Vehicle Dynamics Control System > WIRING DIAGRAM">
STEP | CHECK | YES | NO |
1.CHECK STOP LIGHT SWITCH.
Check the stop light switch. Stop Light Switch > INSTALLATION">
Is the check result OK?
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK">Go to Step 2.
Adjust the installation position of the stop light switch. Stop Light Switch > INSTALLATION">
2.CHECK STOP LIGHT SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the stop light switch connector.
3) Measure the resistance of stop light switch terminals.
Terminals
No. 3 — No. 4:
Is the resistance 1 ? or less when the switch is ON (when pedal is depressed)?
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK">Go to Step 3.
Replace the stop light switch. Stop Light Switch">
3.CHECK STOP LIGHT POWER SUPPLY.
Measure the voltage between stop light switch terminal and chassis ground.
Connector & terminal
(B65) No. 3 (+) — Chassis ground (−):
Is the voltage 10 — 15 V?
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK">Go to Step 4.
Repair the stop light power supply circuit.
4.CHECK STOP LIGHT SWITCH HARNESS (CHECK FOR OPEN CIRCUIT).
1) Disconnect the connector from the VDCCM&H/U.
2) Measure the resistance between VDCCM&H/U and stop light switch.
Connector & terminal
(B65) No. 4 — (B310) No. 30:
Is the resistance less than 1 ??
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK">Go to Step 5.
Repair the stop light switch circuit.
5.CHECK POOR CONTACT OF CONNECTORS.
Is there poor contact of connector between stop light switch and VDCCM&H/U?
Repair the connector.
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK">Go to Step 6.
6.CHECK VDCCM&H/U.
1) Connect all connectors.
2) Perform the Clear Memory Mode. Clear Memory Mode">
3) Perform the Inspection Mode. Inspection Mode">
4) Read the DTC. Read Diagnostic Trouble Code (DTC)">
Is the same DTC displayed?
Replace the VDCCM only. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U) > REPLACEMENT">
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1531 BLS OFF STUCK">Go to Step 7.
7.CHECK DETECTION OF OTHER DTCS FOR VDC.
Read Diagnostic Trouble Code (DTC)">
Is any other DTC displayed?
Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC)">
Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.
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