Mazda CX-7 2007 Workshop Manual page 1353

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
Climate Control Unit
Note
• There is no DTC in the climate control unit that determines signal quality between it and the information
display. Due to this, determine the malfunction location using the DTC on the information display.
1. Inspect the display of DTC U0155 using the M-MDS. (See 09-02D-7 DTC TABLE[MULTIPLEX
COMMUNICATION SYSTEM].)
2. Referring to the following table, determine the malfunctioning part of the CAN system.
Module
Instrument cluster
Climate control
unit
Car- navigation Unit/Audio Unit (Base Module)
Note
• There is no DTC in the car-navigation unit/audio unit (base module) that determines signal quality
between it and the information display. Due to this, determine the malfunction location using the DTC on
the information display.
1. Referring to the following table, determine the malfunctioning part of the CAN system.
Module
Car-navigation unit
Audio unit (base module)
Information display
1. Inspect the display of DTC U0166, U0181 and/or U0184 using the input/output check mode. (See 09-22-15
INFORMATION DISPLAY INPUT/OUTPUT CHECK MODE.)
2. Referring to the following table, determine the malfunctioning part of the CAN system.
Module
Climate control unit
—
—
Information
display
×
×
Communication status
Information display
—
—
×
Communication status
Information display
—
Communication status
Car-navigation unit
Audio unit (base module)
—
×
—
×
• Wiring harness O
—
• Climate control unit
• Wiring harness N
×
• Instrument cluster
• Wiring harness Q
• Wiring harness S
—
• Information display
• Wiring harness P
• Wiring harness Q
• Wiring harness S
• Car-navigation unit
• Audio unit (base module)
• Information display
Instrument cluster
—
×
×
—
×: Normal
— : Communication error
Malfunction location
×: Normal
— : Communication error
Malfunction location
×: Normal
— : Communication error
Malfunction location
• Wiring harness Q
• Wiring harness S
• Information display
• Wiring harness O
• Climate control unit
• Wiring harness P
• Car-navigation unit
• Audio unit (base
module)
• Wiring harness N
• Instrument cluster
09-02D–13
09-02D