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Diagnostic Manual, Info./Comm., Volume 1

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LOCATION:    5.4 Loudspeaker System (LS)    >   22 Electrical Test Program - Preparation for Test

Electrical Test Program - Preparation for Test

1. Battery voltage 11-14 V.
2. Check fuses.
3. Radio OK.
4. Connections to N40/3 OK.
5. Balance, fader, bass and treble adjusted to mid-range setting.
6. Vent ports on door speaker enclosures are free of obstructions (vent ports located on underside of interior door panels).

To prevent damage to the radio and left/right audio power amplifier, the connectors must only be removed or installed with the ignition and
radio OFF .

Electrical wiring diagrams :
Electrical Troubleshooting Manual, Model 140

Conventional tools, test equipment

Description Brand, model, etc.
Digital multimeter 1) Fluke models 23, 83, 85, 87
1) Available through the MBUSA Standard Equipment Program.