Toyota Tundra Service Manual: Parking Brake Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of the parking brake switch assembly.

WIRING DIAGRAM

PROCEDURE

(a) Using the Techstream, read the Data List.

Click here

OK:

Normal condition listed above are displayed.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

(a) Remove the parking brake switch assembly.

Click here

(b) Inspect the parking brake switch assembly.

Click here

NG

REPLACE PARKING BRAKE SWITCH ASSEMBLY

OK

(a) Disconnect the 3H driver side junction block 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 driver side junction block assembly. Click here

*a Component without harness connected (Driver Side Junction Block Assembly)

(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

Click here

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

Standard Resistance:

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY