DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT FUSE (A/C IG, RR A/C NO.2)
INSPECT RR A/C RELAY
INSPECT REAR BLOWER MOTOR
INSPECT NO. 2 AIR CONDITIONING CONTROL ASSEMBLY (REAR BLOWER SWITCH)
INSPECT REAR BLOWER RESISTOR
CHECK REAR COOLING UNIT EXPANSION VALVE (OPERATION)
CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - WIRING AIR CONDITIONING HARNESS)
CHECK HARNESS AND CONNECTOR (REAR BLOWER SWITCH - WIRING AIR CONDITIONING HARNESS)
CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - REAR BLOWER MOTOR)
CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR - BODY GROUND AND BATTERY)
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY AND BODY GROUND)
AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) - Rear Air Conditioning Relay Circuit
DESCRIPTION
When the No. 2 air conditioning control assembly (rear blower switch) is set to position LO or higher, the contact of the RR A/C relay is closed, current flows to the rear blower motor, and the rear blower motor operates. The rear blower motor speed can be changed by exchanging the ground and the rear blower resistor circuit with the No. 2 air conditioning control assembly (rear blower switch).
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.INSPECT FUSE (A/C IG, RR A/C NO.2) |
Remove the A/C IG and RR A/C NO. 2 fuses 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 |
| RR A/C NO. 2 fuse | Always | Below 1 Ω |
Remove the RR A/C 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 - 4 |
Battery voltage is not applied between terminals 1 and 2 | Below 1 Ω |
| 3 - 5 |
Battery voltage is not applied between terminals 1 and 2 | 10 kΩ or higher |
| 3 - 4 |
Battery voltage is applied to terminals 1 and 2 | 10 kΩ or higher |
| 3 - 5 |
Battery voltage is applied to terminals 1 and 2 | Below 1 Ω |
| 3.INSPECT REAR BLOWER MOTOR |
Disconnect the z49 motor connector.
Connect the battery's positive (+) lead to terminal 2 and the negative (-) lead to terminal 1, then check that the rear blower motor operates smoothly.
- OK:
- The rear blower motor operates smoothly.
Measure the current according to the value(s) in the table below.
- Standard Current:
| Tester Connection | Condition | Specified Condition |
| z49-1 (-) - z49-2 (+) |
Rear blower motor operates | 1 to 3 A |
| | REPLACE REAR BLOWER MOTOR ()
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| 4.INSPECT NO. 2 AIR CONDITIONING CONTROL ASSEMBLY (REAR BLOWER SWITCH) |
Remove the No. 2 air conditioning control assembly ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| ALL - E89-6 (E) | OFF | 10 kΩ or higher |
| E89-5 (LO) - E89-6 (E) | LO | Below 1 Ω |
| E89-3 (M1) - E89-6 (E) | M1 | Below 1 Ω |
| E89-4 (M2) - E89-6 (E) | M2 | Below 1 Ω |
| E89-8 (HI) - E89-6 (E) | HI | Below 1 Ω |
| | REPLACE NO. 2 AIR CONDITIONING CONTROL ASSEMBLY ()
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| 5.INSPECT REAR BLOWER RESISTOR |
Remove the rear blower resistor ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| z52-1 (HI) - z52-2 (M1) | Always | 1.32 to 1.52 Ω |
| z52-1 (HI) - z52-3 (M2) | Always | 0.39 to 0.45 Ω |
| z52-1 (HI) - z52-4 (LO) | Always | 2.24 to 2.4 Ω |
| | REPLACE REAR BLOWER RESISTOR ()
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| 6.CHECK REAR COOLING UNIT EXPANSION VALVE (OPERATION) |
Replace the rear cooling unit expansion valve ().
- Since the rear cooling unit expansion valve cannot be inspected while it is removed from the vehicle, replace the rear cooling unit expansion valve with a normal one and check that the condition returns to normal.
- OK:
- Same problem does not occur.
| OK | |
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| CHECK REAR COOLING UNIT EXPANSION VALVE ()
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| 7.CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - WIRING AIR CONDITIONING HARNESS) |
Disconnect the wiring air conditioning harness sub-assembly connector.
Disconnect the z52 rear blower resistor connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 6 (M1) - z52-2 (M1) | Always | Below 1 Ω |
| 5 (M2) - z52-3 (M2) | Always | Below 1 Ω |
| 4 (HI) - z52-1 (HI) | Always | Below 1 Ω |
| 7 (LO) - z52-4 (LO) | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 8.CHECK HARNESS AND CONNECTOR (REAR BLOWER SWITCH - WIRING AIR CONDITIONING HARNESS) |
Disconnect the E89 No. 2 air conditioning control assembly connector.
Disconnect the Wiring air conditioning harness sub-assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E89-3 (M1) - 6 (M1) | Always | Below 1 Ω |
| E89-4 (M2) - 5 (M2) | Always | Below 1 Ω |
| E89-8 (HI) - 4 (HI) | Always | Below 1 Ω |
| E89-5 (LO) - 7 (LO) | Always | Below 1 Ω |
| E89-6 (E) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 9.CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - REAR BLOWER MOTOR) |
Disconnect the z52 rear blower resistor connector.
Disconnect the z49 rear motor connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| z52-1 (HI) - z49-1 | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 10.CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR - BODY GROUND AND BATTERY) |
Disconnect the z49 rear motor connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| z49-2 - Body ground | Always | Below 1 Ω |
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| z49-2 - Body ground |
Engine switch on (IG)
Heater control (blower switch) HI | 11 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 11.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY AND BODY GROUND) |
Disconnect the E81air conditioning amplifier connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| E81-18 (RCRL) - Body ground |
Engine switch on (IG)
Heater control (blower switch): OFF | 11 to 14 V |
| E81-18 (RCRL) - Body ground |
Engine switch on (IG)
Heater control (blower switch): ON | Below 1 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E81-14 (GND) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE ()
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