DTC Advanced Diagnostics: C1270-15

DTC C1270-15: Automatic Brake Hold Switch Signal Circuit Open

NOTE

	Initial Diagnosis: The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the ABS/VSA indicator comes on, and continues until the indicator goes off.
	Regular Diagnosis: The regular on-board diagnosis begins right after the ABS/VSA indicator goes off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode.
	Review "How to troubleshoot the VSA 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 9.6 - 16.5 V

With the Driving Pattern:

1.	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

Possible Cause

	Open or Short to power between the electric parking brake/automatic brake hold switch and the gauge control module (BRAKE HOLD line)
	Open between the electric parking brake/automatic brake hold switch and body ground (GND line)
	Electric parking brake/automatic brake hold switch failure
	Gauge control module internal failure