DESCRIPTION This circuit is from the parking brake switch assembly to the radio and display receiver assembly. WIRING DIAGRAM ![]() PROCEDURE
(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.
(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:
(a) Remove the parking brake switch assembly (See page
(b) Inspect the parking brake switch assembly (See page
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Toyota Tundra Service Manual > How To Troubleshoot Ecu Controlled Systems: Electronic Circuit Inspection Procedure
ELECTRONIC CIRCUIT INSPECTION PROCEDURE 1. BASIC INSPECTION (a) WHEN MEASURING RESISTANCE OF ELECTRONIC PARTS (1) Unless otherwise stated, all resistance measurements should be made at an ambient temperature of 20°C (68°F). Resistance measurements may be inaccurate if measured at high temperatures ...