Toyota Tundra Service Manual: Parking Brake Switch Circuit

DESCRIPTION

This circuit includes the parking brake switch assembly and navigation receiver assembly.

WIRING DIAGRAM

PROCEDURE

1.	CHECK VEHICLE SIGNAL (OPERATION CHECK)

(a) Display the "Vehicle Signal Check Mode" screen (See page ).

(b) Check that the display changes between ON and OFF according to the parking brake operation.

OK:

Parking Brake Condition	Display
Applied	ON
Released	OFF

HINT:

This display is updated once per second. As a result, it is normal for the display to lag behind the actual parking brake operation.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - PARKING BRAKE SWITCH ASSEMBLY)

(a) Disconnect the J135 navigation receiver assembly connector.

(b) Disconnect the A5 parking brake switch assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
J135-15 (PKB) - A5-1	Always	Below 1 Ω
J135-15 (PKB) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT PARKING BRAKE SWITCH ASSEMBLY

(a) Remove the parking brake switch assembly (See page ).

(b) Inspect the parking brake switch assembly (See page ).

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE PARKING BRAKE SWITCH ASSEMBLY

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Toyota Tundra Owners Manual