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### AUDIO AND VISUAL SYSTEM > Illumination Circuit

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## DESCRIPTION

The radio receiver panel illuminates when the light control switch is in the TAIL or HEAD position.

## WIRING DIAGRAM

## INSPECTION PROCEDURE

1.CHECK WIRE HARNESS (RADIO RECEIVER ASSEMBLY - BATTERY AND BODY GROUND)

1. Disconnect the R1 receiver connector.

1. Measure the voltage and resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Condition | Specified Condition
     R1-7 (GND) - Body ground | Always | Below 1 Ω

     Standard voltage:

     Tester Connection | Condition | Specified Condition
     R1-10 (+ILL) - Body ground | Lamp control switch OFF | Below 1 V
     R1-10 (+ILL) - Body ground | Light control switch TAIL or HEAD | 10 to 14 V

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE