Toyota Tundra Service Manual: Brake System Malfunction (C13A9)

Toyota Tundra Service Manual / Brake / Brake Control / Dynamic Control Systems / Trailer Brake Control System / Brake System Malfunction (C13A9)

DESCRIPTION

This DTC is stored when a malfunction is detected in the vehicle stability control system. Check the vehicle stability control system when DTC C13A9 is stored.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area
C13A9	Brake System Malfunction	-	An oil pressure sensor or ABS system malfunction signal is received for 1 second or more from the skid control ECU (brake actuator assembly)	Vehicle stability control system Trailer brake control ECU (brake control with bracket relay)

CAUTION / NOTICE / HINT

NOTICE:

The trailer brake control system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

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PROCEDURE

1.	CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

HINT:

Trailer brake control system DTC C13A9 may be stored due to a malfunction in the vehicle stability control system. Therefore, it is necessary to check for and troubleshoot vehicle stability control system DTCs first.

(a) Check for DTCs.

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Result	Proceed to
Vehicle stability control system DTCs are not output	A
Vehicle stability control system DTCs are output	B

GO TO VEHICLE STABILITY CONTROL SYSTEM

2.	CHECK FOR DTCs (TRAILER BRAKE CONTROL SYSTEM)

(a) Clear the DTCs.

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(b) Turn the ignition switch off.

(d) Check if the same DTC is output.

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Result	Proceed to
DTCs C13A9 is not output.	A
DTCs C13A9 is output.	B

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE CONTROL WITH BRACKET RELAY

Trailer Brake Control System

Slider Switch Circuit (C14A0)

See More:

Toyota Tundra Owners Manual > Steps to take in an emergency: If a warning message is displayed
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