DTC C1270-11

DTC C1270-11: Automatic Brake Hold Switch Signal Circuit Short

NOTE:

Initial Diagnosis:
The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the brake system indicator (red or amber) comes on, and continues until the indicator goes off.
Regular Diagnosis:
The regular on-board diagnosis begins right after the brake system indicator (red or amber) goes off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode.
Review "How to Troubleshoot the Electric Servo Brake System" before doing the DTC troubleshooting procedure.
Test-drive the vehicle according to local traffic conditions and regulations. Do not test-drive on a lift unless specified.
The possible causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Confirmation Procedure	Basic Condition: 12 volt battery voltage 9.5 - 16.7 V Operating Condition: Turn the vehicle to the ON mode.
Execution	Regular Diagnosis
Duration	About 1 second
DTC Type	1 drive cycle Brake system indicator (amber) on
Fail Safe Action	Stop automatic brake hold function (re-diagnose at the next IG-ON)
Possible Cause	Short to ground between the automatic brake hold switch and the gauge control module (BRAKE HOLD line) Automatic brake hold switch failure Gauge control module internal failure