DESCRIPTION When the air conditioning control assembly (rear window defogger switch) is turned on, a rear window defogger activation request signal is sent via the LIN communication line to the air conditioning amplifier. Then the air conditioning amplifier operates the rear window defogger. WIRING DIAGRAM ![]() CAUTION / NOTICE / HINT HINT: This circuit uses the LIN communication line. Before performing the inspection,
check that the LIN communication system is functioning normally (see page
NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. PROCEDURE
(a) Select the Active Test, using the Techstream to generate a control command,
and then check that the rear window defogger operates (See page
OK: Rear window defogger operates normally.
(a) Temporarily replace the air conditioning control assembly with a new or normally
functioning one (See page (b) Check that the malfunction disappears. OK: Malfunction disappears.
![]() (a) Remove the defogger relay (DEF) from the engine room relay block, junction block. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(a) Remove the defogger relay (DEF) from the engine room relay block, junction block. (b) Disconnect the J19 air conditioning amplifier connector. (c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(d) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Disconnect the P9 and P10 rear window glass (defogger wire) connectors. (b) Remove the defogger relay (DEF) from the engine room relay block, junction block. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Perform the on-vehicle inspection, check that the window defogger system
operates normally (See page OK: Malfunction disappears.
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Toyota Tundra Service Manual > Power Door Lock Control System: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use the following procedures to troubleshoot the power door lock control system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2. CUSTOMER PROBLEM ANALYSIS CHECK HINT: In troubleshooting, confirm that the problem symptoms have been accurately iden ...