Toyota Tundra Service Manual: Parking Brake Switch Circuit

DESCRIPTION

This circuit is from the parking brake switch assembly to the radio and display receiver assembly.

WIRING DIAGRAM

PROCEDURE

(a) Enter the "Vehicle Signal Check Mode" screen. [Refer to Check Touch Switch in Operation Check (See page )]

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

OK:

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.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

(a) Disconnect the J139 radio and display receiver assembly connector.

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

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

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

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE PARKING BRAKE SWITCH ASSEMBLY