Mazda 2007 CX-9, Service Highlights, Page: 584 / 614

INSTRUMENTATION/DRIVER INFO.
09-22–12
WATER TEMPERATURE GAUGE CONTROL OUTLINE
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The engine coolant temperature signal is output from the PCM to the microcomputer in the instrument cluster.
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WATER TEMPERATURE GAUGE CONTROL CONSTRUCTION/OPERATION
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System Wiring Diagram
Operation
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The engine coolant temperature signal sent from the PCM via the CAN system is input to the microcomputer in
the instrument cluster. The microcomputer calculates the current engine coolant temperature based on the
engine coolant temperature signal, and sends an output signal to the water temperature gauge.
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BURNT OUT BULB CHECK FUNCTION OUTLINE
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The microcomputer in the instrument cluster illuminates the brake system warning light when the ignition switch
is in the ON position. Due to this, the brake system warning light function can be inspected for a burnt out bulb.
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BURNT OUT BULB CHECK FUNCTION CONSTRUCTION/OPERATION
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System Wiring Diagram
Operation
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The microcomputer in the instrument cluster illuminates the brake system warning light for approx. 3 s and
then turns it off when the ignition switch is turned to the ON position. (When the parking brake switch or the
brake fluid level sensor is on, the brake system warning light remains illuminated.)
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IG1 B+
1V
1F 1W 1X
1H
INSTRUMENT
CLUSTER
MICROCOMPUTER
PCM
WATER TEMPERATURE GAUGE
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1V
IG1
INSTRUMENT CLUSTER
MICROCOMPUTER
BRAKE SYSTEM
WARNING LIGHT
BRAKE FLUID
LEVEL SENSOR
PARKING BRAKE SWITCH
1F 1W 1X
BCM
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