TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
p.102

BE/Body Electrical Systems — Cd Inserts, But No Power / Power Coming In, But Cd Player Not Operating, page 103

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p.104
Cd Inserts, But No Power / Power Coming In, But Cd Player Not Operating — MK4 Supra Body Electrical Systems, page 103
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Page text (OCR transcript)
BE–103
BODY ELECTRICAL SYSTEM – AUDIO SYSTEM

19  CD Player          CD INSERTS, BUT NO POWER

Is radio operating normally?  →Yes→  Is ACC applied to CD player?  →No→  Radio assembly faulty.
                    ↓No                    ↓Yes
                                    CD player faulty.

Check if RAD No.2 fuse is OK?  →NG→  Replace fuse.
                    ↓OK
Is ACC applied to power amplifier?  →No→  ACC wire harness faulty.
                    ↓Yes
Is ACC applied to radio assembly?  →No→  Power amplifier faulty.
                    ↓Yes
Radio assembly faulty.

20  CD Player          POWER COMING IN, BUT CD PLAYER NOT OPERATING

Is CD installed correct side up?  →No→  Install correctly.
                    ↓Yes
Functions OK if different CD installed?  →Yes→  CD faulty.
                    ↓No
Is radio operating normally?  →Yes→  Is temperature inside cabin hot?  →Yes→  Protective circuit in operation.
                    ↓No                    ↓No
                              Has sudden temperature change  →Yes→  Formation of condensation
                              occurred inside cabin?                  due to temp. change.
                                           ↓No
                                    CD player faulty.

Is there continuity in speaker wire  →No→  Speaker wire harness faulty.
harness?
                    ↓Yes
Temporarily install another speaker.  →Yes→  Speaker faulty.
Functions OK?
                    ↓No
Hissing sound from speaker?  →No→  Power amplifier faulty. Recheck system after repair.
                    ↓Yes
Radio assembly faulty. Recheck system after repair.