INSPECTION PROCEDURE 1. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY (for Standard) (a) When there is a malfunction such as noise from a speaker or no sound at all, replace the speaker with a new one and check that the malfunction disappears. OK: Malfunction disappears. HINT:
2. INSPECT FRONT NO. 2 SPEAKER ASSEMBLY (for 12 Speakers)  (a) Measure the resistance according to the value(s) in the table below. Standard resistance:
If the result is not as specified, replace the front No. 2 speaker assembly. Text in Illustration
3. INSPECT FRONT NO. 4 SPEAKER ASSEMBLY (for Standard) (a) Temporarily replace the front No. 4 speaker assembly with a new or normally functioning one. OK: Malfunction disappears. HINT: Connect the connectors to the front No. 4 speaker assembly. 4. INSPECT FRONT NO. 4 SPEAKER ASSEMBLY (for 12 Speakers)  (a) Measure the resistance according to the value(s) in the table below. Standard resistance:
If the result is not as specified, replace the front No. 4 speaker assembly. Text in Illustration
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Toyota Tundra Service Manual > Navigation System: Sound Quality is Bad Only when Disc is Played (Volume is Too Low)
PROCEDURE 1. REPLACE DISC WITH ANOTHER AND RECHECK (a) Replace the disc with a known good one and check that the malfunction disappears. OK: Malfunction disappears. Result Result Proceed to OK A NG (for Column Shift Type) B NG (for Floor Shift Type) C A END (DISC IS DEFECTIVE) B REPLACE NAVIGATION R ...
