DESCRIPTION
WIRING DIAGRAM ![]() PROCEDURE
(a) Turn the ignition switch off. (b) Remove the trailer brake control switch. Click here
(c) Inspect the trailer brake control switch. Click here OK: The trailer brake control switch operates normally.
(a) Disconnect the J172 trailer brake control ECU (brake control with bracket relay) connector. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Check the GAIN (+/-) selection button (trailer brake control switch) operation condition. OK: he GAIN (+/-) selection button (trailer brake control switch) has not been pushed and held for 1 minute or more.
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Toyota Tundra Service Manual > Meter / Gauge System: Last Communication With Navigation ECU (U0163)
DESCRIPTION The combination meter assembly communicates with the navigation receiver assembly via the CAN line. DTC Code DTC Detection Condition Trouble Area U0163 When either of following conditions is detected: IG voltage 10.5 V or more No communication with navigation receiver assembly continues ...