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.
(a) Remove the parking brake switch assembly. Click here (b) Inspect the parking brake switch assembly. Click here
(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:
(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:
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Toyota Tundra Service Manual > Front Power Seat Control System(w/o Memory): Operation Check
OPERATION CHECK 1. CHECK FRONT POWER SEAT FUNCTION (a) Check the basic functions. (1) Operate the power seat switches and check to make sure each seat function works: Slide Front vertical (for Driver Side) Lifter (for Driver Side) Reclining Lumbar support 2. CHECK POWER SEAT MOTOR ASSEMBLY (SLIDING, ...
