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

1.

CHECK PARKING BRAKE SWITCH ASSEMBLY

(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:

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.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - PARKING BRAKE SWITCH ASSEMBLY)

(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:

Tester Connection

Condition

Specified Condition

J139-15 (PKB) - A5-1

Always

Below 1 Ω

J139-15 (PKB) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT PARKING BRAKE SWITCH ASSEMBLY

(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

    Panel Switches do not Function

    Parts Location

    See More:

    Toyota Tundra Service Manual > Radio Receiver(for Floor Shift Type): Removal
    REMOVAL PROCEDURE 1. PRECAUTION NOTICE: After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (See page ). 2. ...

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