mercury Workshop Repair Guides

Mercury Workshop Service and Repair Manuals

Initial Inspection and Diagnostic Overview|Page 7895 > < Initial Inspection and Diagnostic Overview|Page 7893
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B6

Normal Operation

The message center switch is hardwired to the instrument cluster through circuits CMC29 (GN/VT) and RMC27 (WH/BN). To communicate the
requested switch function, each message center switch button uses a different resistance value, allowing the instrument cluster to determine which
switch is pressed.

Possible Causes

-

circuit CMC29 (GN/VT) open, short to ground, or short to voltage

-

circuit RMC27 (WH/BN) open, short to ground, or short to voltage

-

message center switch

-

instrument cluster

Test C: The Compass Is Inoperative

PINPOINT TEST C: THE COMPASS IS INOPERATIVE

C1-C2

Initial Inspection and Diagnostic Overview|Page 7895 > < Initial Inspection and Diagnostic Overview|Page 7893