PROCEDURE
(a) Replace the disc with a known good one and check that the malfunction disappears. OK: Malfunction disappears.
(a) Check that the radio and display receiver assembly is properly installed Result
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Toyota Tundra Service Manual > Trailer Brake Control Switch: Installation
INSTALLATION PROCEDURE 1. INSTALL TRAILER BRAKE CONTROL ECU (BRAKE CONTROL WITH BRACKET RELAY) (a) Connect the connector. (b) Install the trailer brake control switch with the 2 bolts. Torque: xx N*m (xx kgf*cm, xx in.*lbf) 2. INSTALL NO. 2 SWITCH HOLE BASE 3. INSTALL LOWER INSTRUMENT PANEL FINISH P ...