Subaru Crosstrek Service Manual: 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.

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.

Dtc c1431 at

Dtc c1532 bls on stuck

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