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 > Sfi System: Open in Secondary Air Injection System Heater Control Circuit (P144C,P144D)
DESCRIPTION The ECM operates the air pump heater (AI HTR) relay which causes the air pump heater (AI HTR) to operate. DTC No. DTC Detection Condition Trouble Area P144C Open or short in the air pump heater (AI HTR) relay circuit for 5 seconds (1 trip detection logic). Open or short in air pump heate ...
