Operation Check OPERATION CHECK 1. CHECK MIRROR HEATER (a) Turn the ignition switch ON. (b) Check that pressing the rear defogger switch illuminates the indicator and warms the mirror surface. (c) Check that after approximately 15 minutes, the indicator light turns off and the mirror heater deactivates. Parts Location PARTS LOCATION ILLUSTRATION 
Problem Symptoms Table PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary. Power mirror control system
System Diagram SYSTEM DIAGRAM 
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Toyota Tundra Service Manual > Can Communication System: Check Bus 1 Line for Short to GND
DESCRIPTION There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and termina ...
