DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK CAN COMMUNICATION SYSTEM
READ VALUE USING INTELLIGENT TESTER (A/C SIGNAL)
INSPECT FUSE (A/C IG)
INSPECT MAGNETIC CLUTCH RELAY
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)
INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY
INSPECT COOLER COMPRESSOR ASSEMBLY
INSPECT MAGNETIC CLUTCH
CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - BATTERY)
AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) - Air Conditioning Compressor Magnetic Clutch Circuit
DESCRIPTION
When the air conditioning amplifier assembly is turned on, a magnetic clutch on signal is sent from the MGC terminal of the air conditioning amplifier assembly. Then, the magnetic clutch relay turns on to operate the magnetic clutch.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK CAN COMMUNICATION SYSTEM |
Check for CAN communication system DTCs related to the air conditioning system.
Result| Result | Proceed to |
| CAN DTC is not output | A |
| CAN DTC is output (for LHD) | B |
| CAN DTC is output (for RHD) | C |
| | GO TO CAN COMMUNICATION SYSTEM ()
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| | GO TO CAN COMMUNICATION SYSTEM ()
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| 2.READ VALUE USING INTELLIGENT TESTER (A/C SIGNAL) |
Use the Data List to check if the A/C switch is functioning properly.
Engine| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| A/C Signal | A/C signal / ON or OFF | ON: A/C switch on
OFF: A/C switch off | - |
- OK:
- The display is as specified in the normal condition.
Remove the A/C IG fuse from the cowl side junction block LH.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| A/C IG fuse | Always | Below 1 Ω |
| 4.INSPECT MAGNETIC CLUTCH RELAY |
Remove the magnetic clutch relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 3 - 5 | Voltage not applied to terminals 1 and 2 | 10 kΩ or higher |
| 3 - 5 | Voltage applied to terminals 1 and 2 | Below 1 Ω |
Install the magnetic clutch relay to the engine room relay block.
| | REPLACE MAGNETIC CLUTCH RELAY |
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| 5.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY) |
w/ Rear Heater
Disconnect the E36 amplifier connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| E36-18 (MGC) - Body ground | Engine switch off | Below 1 V |
| E36-18 (MGC) - Body ground | Engine switch on (IG) | 11 to 14 V |
w/o Rear Heater
Disconnect the E81 amplifier connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| E81-20 (MGC) - Body ground | Engine switch off | Below 1 V |
| E81-20 (MGC) - Body ground | Engine switch on (IG) | 11 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 6.INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY |
w/ Rear Heater
Reconnect the E36 amplifier connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| E36-18 (MGC) - Body ground | Engine switch on (IG)
A/C switch off | 11 to 14 V |
| E36-18 (MGC) - Body ground | Engine switch on (IG)
A/C switch on | Below 1 V |
w/o Rear Heater
Reconnect the E81 amplifier connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| E81-20 (MGC) - Body ground | Engine switch on (IG)
A/C switch off | 11 to 14 V |
| E81-20 (MGC) - Body ground | Engine switch on (IG)
A/C switch on | Below 1 V |
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
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| 7.INSPECT COOLER COMPRESSOR ASSEMBLY |
Disconnect the C30 compressor connector.
Disconnect the A magnetic clutch connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| C30-3 (MG+) - A-1 | Always | Below 1 Ω |
| C30-3 (MG+) - Body ground | Always | 10 kΩ or higher |
| | REPLACE COOLER COMPRESSOR ASSEMBLY ()
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| 8.INSPECT MAGNETIC CLUTCH |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| A-1 - Body ground | 20°C (68°F) | 3.4 to 3.8 Ω |
When connector terminal A-1 is connected to the positive (+) battery terminal, check that the following occurs: 1) the operating sound of the magnetic clutch can be heard, and 2) the hub and rotor of the magnetic clutch lock.
| 9.CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - BATTERY) |
Remove the magnetic clutch relay from the engine room relay block.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| Relay block magnetic clutch relay terminal 5 - Body ground | Engine switch on (IG) | 11 to 14 V |
| Relay block magnetic clutch relay terminal 1 - Body ground | Engine switch on (IG) | 11 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM RELAY BLOCK - BATTERY) |
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| OK | |
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| REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM RELAY BLOCK - COOLER COMPRESSOR) |
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