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Climate Control Unit Inspection [Manual Air Conditioner]

  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  2. Remove the climate control unit with the connector connected. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER] .)
  3. Connect the negative battery terminal.
  4. Switch the ignition ON (engine off or on).
  5. Connect the negative (-) lead of the tester to body ground.
  6. Insert the positive (+) lead of the tester into each climate control unit terminal and measure the voltage according to the terminal voltage table.
    • If there is any malfunction, inspect the parts under "Inspection item(s)".

Terminal Voltage Table (Reference) 

G16375714Courtesy of MAZDA MOTORS CORP.
Terminal Signal name Connected to Measurement condition Voltage (V) Inspection item(s)
1A B+ F19 10 A fuse Under any condition B+
  • Related wiring harness
  • F19 10 A fuse
1B - - - - -
1C IG F47 15 A fuse Switch the ignition ON (engine off or on) B+
  • Related wiring harness
  • F47 15 A fuse
Switch the ignition off 1.0 or less
1D Glove compartment light Glove compartment light control(1) Light switch at TNS position B+
  • Relate wiring harness
Light switch at OFF position 1.0 or less
1E - - - - -
1F - - - - -
1G GND Body ground Under any condition Approx. 0
  • GND point
  • Related wiring harness
1H - - - - -
1I HS_CAN_H CAN related module Because this terminal is for communication, integrity determination by terminal voltage is not possible.
  • Related wiring harness
1J HS_CAN_H CAN related module Because this terminal is for communication, integrity determination by terminal voltage is not possible.
  • Related wiring harness
1K HS_CAN_L CAN related module Because this terminal is for communication, integrity determination by terminal voltage is not possible.
  • Related wiring harness
1L HS_CAN_L CAN related module Because this terminal is for communication, integrity determination by terminal voltage is not possible.
  • Related wiring harness
1M - - - - -
1N - - - - -
1O - - - - -
1P - - - - -
2A HS_CAN_H CAN related module Because this terminal is for communication, integrity determination by terminal voltage is not possible.
  • Related wiring harness
2B - - - - -
2C HS_CAN_L CAN related module Because this terminal is for communication, integrity determination by terminal voltage is not possible.
  • Related wiring harness
2D - - - - -
2E - - - - -
2F - - - - -
2G - - - - -
2H - - - - -
(1) With glove compartment light
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