PROCEDURE
(a) Replace the disc with a known good one and check that the malfunction disappears. OK: Malfunction disappears.
(a) Check that the navigation receiver assembly is properly installed Result
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Toyota Tundra Service Manual > Cargo Light Switch: Inspection
INSPECTION PROCEDURE 1. INSPECT DECK LIGHT SWITCH ASSEMBLY (a) Check the resistance. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Switch Condition Specified Condition 5 (CCTY) - 9 (CGON) Cargo light switch ON Below 1 Ω Cargo light s ...