DESCRIPTION The combination meter assembly receives the air conditioning control assembly (hazard warning signal switch) ON signal and controls the operation of the hazard warning lights. WIRING DIAGRAM 
CAUTION / NOTICE / HINT NOTICE: When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored. PROCEDURE
(a) Using the Techstream, read the Data List. Click here
OK: Normal condition listed above are displayed.
(a) Remove the air conditioning control assembly (hazard warning signal switch). Click here (b) Inspect the air conditioning control assembly (hazard warning signal switch). Click here
(a) Disconnect the J127 air conditioning control assembly (hazard warning signal switch) connector. (b) Disconnect the J28 combination meter assembly connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Tundra Service Manual > Sfi System: Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION When troubleshooting OBD II (On-Board Diagnostics) vehicles, the Techstream (complying with SAE J1978) must be connected to the DLC3 (Data Link Connector 3) of the vehicle. Various data in the vehicle's ECM (Engine Control Module) can then be read. OBD II regulations ...
