NO.7 NO COOL AIR [MANUAL AIR CONDITIONER]SM2445615
NO.7 NO COOL AIR [MANUAL AIR CONDITIONER]

id0702c2812600

7
No cool air
DESCRIPTION
• Magnetic clutch does not operate.
POSSIBLE CAUSE
Note
• The R.WIP 10 A fuse is connected to the pull-up side between climate control unit terminal T and BCM terminal 3J (LIN circuit). A refrigerant pressure signal is not sent to the BCM and the A/C compressor does not operate because LIN communication is not performed if there is a malfunction with the R.WIP 10 A fuse.
• R.WIP 10 A fuse malfunction
• Short to ground in wiring harness between R.WIP 10 A fuse and BCM terminal 4D
• Short to ground in wiring harness between R.WIP 10 A fuse and rear wiper motor terminal A
• Short to ground in wiring harness between R.WIP 10 A fuse and sunroof motor terminal E
• Improper refrigerant charging amount
• Open A/C magnetic clutch
• Open or short circuit in wiring harness between evaporator temperature sensor and climate control unit
• Malfunction in evaporator temperature sensor (internal circuit malfunction)
• Open circuit between the A/C relay and A/C magnetic clutch
• Poor ground of A/C magnetic clutch
• Refrigerant pressure sensor malfunction.
• A/C relay is stuck open.
• Seized A/C compressor
• Climate control unit malfunction
― A/C switch or fan switch malfunction, or climate control unit does not determine A/C request or transmit the A/C request signal.
• BCM malfunction
― BCM does not receive A/C request signal from climate control unit or transmit it to PCM.
― BCM does not receive refrigerant pressure signal from climate control unit or transmit it to PCM.
• Communication error between climate control unit and BCM
― Open or short circuit in wiring harness between climate control unit terminal J and BCM terminal 3L
― Open or short circuit in wiring harness between climate control unit terminal T and BCM terminal 3J
• Communication error between BCM and PCM

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, inspect to make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
AIR FLOW INSPECTION
• Does air blow from vents?
Yes
Go to the next step.
No
Go to Step 1 of troubleshooting indexes No.1 and 2.
2
INSPECT A/C COMPRESSOR OPERATION
• Start engine.
• Turn A/C switch and airflow volume control dial on.
• Does A/C compressor operate?
Yes
Go to Step 1 of troubleshooting index No.6.
No
Go to the next step.
3
INSPECT FUSE
• Turn the ignition to LOCK.
• Remove the R.WIP 10 A fuse.
• Inspect the R.WIP 10 A fuse.
• Is the fuse normal?
Yes
Install the R.WIP 10 A fuse, then go to the Step 5.
No
Replace the R.WIP 10 A fuse, then go to the next step.
4
INSPECT R.WIP 10 A FUSE CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between the R.WIP 10 A fuse (wiring harness-side) and body ground.
• Is there continuity?
Yes
Inspect the following wiring harness and repair or replace the malfunctions part.
• Wiring harness between R.WIP 10 A fuse and BCM terminal 4D
• Wiring harness between R.WIP 10 A fuse and rear wiper motor terminal A
• Wiring harness between R.WIP 10 A fuse and sunroof motor terminal E
Go to Step 23.
No
Go to Step 23.
5
INSPECT FOR DTC IN PCM AND BCM
• Inspect for DTCs related to the PCM and BCM on-board diagnostic system.
• Are any DTCs displayed?
Yes
Go to appropriate inspection procedure.
No
Go to the next step.
6
INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C MAGNETIC CLUTCH CONTROL OR A/C REQUEST SIGNAL
• Access PCM PID ACCS using the M-MDS.
• Start the engine and idle it.
• Turn the PID ACCS to ON from OFF using the M-MDS simulation function.
• Is the A/C magnetic clutch engaged?
Yes
Go to the next step.
No
Go to Step 18.
7
CHECK BCM RECEIVE A/C REQUEST SIGNAL FROM CLIMATE CONTROL UNIT
• Access BCM PID ACSW. (See PID/DATA MONITOR INSPECTION [BCM].)
• Monitor the PID ACSW while turning on and off the air conditioner by switching the control panel.
• Is the PID normal?
Yes
Go to Step 10.
No
Go to the next step.
8
INSPECT TO SEE CLIMATE UNIT TRANSMIT A/C REQUEST SIGNAL TO BCM
• Remove the climate control unit.
• Reconnect the climate control unit connector.
• Start the engine and idle it.
• Measure the climate control unit terminal J (24-pin) voltage while turning on and off the air conditioner by control panel.
• Is the voltage change in specified according to control panel switching? (See CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER].)
Specification:
Turn on the A/C: Below 1.0 V
Turn off the A/C: Approx. 5 V
Yes
Replace the BCM then go to Step 23.
(BCM can not receive the A/C request signal from climate control unit or transmit it to PCM.)
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
No
Go to the next step.
9
INSPECT TO SEE WHETHER MALFUNCTION IS IN BCM OR A/C REQUEST SIGNAL WIRING HARNESS
• Inspect for open or short circuit between climate control unit terminal J (24-pin) and BCM terminal 3L.
• Is there any open or short circuit detected?
Yes
Repair or replace for open or short circuit then go to Step 23.
No
Replace the climate control unit then go to Step 23.
(A/C switch malfunction or climate control unit can not determine A/C request or transmit it to BCM)
(See CLIMATE CONTROL UNIT REMOVAL [MANUAL AIR CONDITIONER].)
(See CLIMATE CONTROL UNIT INSTALLATION [MANUAL AIR CONDITIONER].)
10
INSPECT TO SEE WHETHER MALFUNCTION IS IN EVAPORATOR TEMPERATURE SENSOR SIGNAL OR ELSEWHERE
• Start the engine and idle it.
• Measure the voltage for climate control unit terminal I.
• Is the voltage normal?
Yes
Go to Step 13.
No
Go to the next step.
11
INSPECT TO SEE WHETHER MALFUNCTION IS IN SENSOR GROUND CIRCUIT OR ELSEWHERE
• Turn the ignition to on (Engine off).
• Measure the following climate control unit terminal K.
• Is the voltage normal? (See CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER].)
Specification:
Below 1.0 V
Yes
Go to the next step.
No
Replace the climate control unit go to Step 23.
(See CLIMATE CONTROL UNIT REMOVAL [MANUAL AIR CONDITIONER].)
(See CLIMATE CONTROL UNIT INSTALLATION [MANUAL AIR CONDITIONER].)
12
INSPECT TO SEE WHETHER MALFUNCTION IS IN EVAPORATOR TEMPERATURE SENSOR OR RELATED WIRING HARNESS
• Inspect for open or short circuit between following climate control unit terminal (24-pin) and evaporator temperature sensor terminal.
― Between climate control unit terminal K and evaporator temperature sensor terminal A
― Between climate control unit terminal I and evaporator temperature sensor terminal B
• Is there any open or short circuit detected?
Yes
Repair or replace for open or short circuit then go to Step 23.
No
Replace the evaporator temperature sensor then go to Step 23.
(See A/C UNIT DISASSEMBLY/ASSEMBLY [MANUAL AIR CONDITIONER].)
13
INSPECT TO SEE WHETHER MALFUNCTION IS IN CONTROL UNIT OR REFRIGERANT PRESSURE SIGNAL
• Inspect the refrigerant pressure sensor. (See REFRIGERANT PRESSURE SENSOR INSPECTION [MANUAL AIR CONDITIONER].)
• Is the refrigerant pressure sensor normal?
Yes
Go to Step 17.
No
Go to the next step.
14
INSPECT REFRIGERANT PRESSURE
• Inspect the refrigerant pressure. (See REFRIGERANT PRESSURE CHECK.)
• Is the refrigerant pressure normal?
Yes
Go to the next step.
No
Repair or replace malfunction par according to inspection result then go to Step 23.
15
INSPECT TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR ELSEWHERE
• Turn the ignition to on (Engine off).
• Measure the following climate control unit terminal E.
• Is the voltage normal? (See CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER].)
Specification:
Approx. 5 V
Yes
Go to next step.
No
Replace the climate control unit then go to Step 23.
(See CLIMATE CONTROL UNIT REMOVAL [MANUAL AIR CONDITIONER].)
(See CLIMATE CONTROL UNIT INSTALLATION [MANUAL AIR CONDITIONER].)
16
INSPECT TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT PRESSURE SENSOR OR RELATED WIRING HARNESS
• Inspect for open or short circuit between following climate control unit terminal (24-pin) and refrigerant pressure sensor terminal.
― Between climate control unit terminal E and refrigerant pressure sensor terminal A
― Between climate control unit terminal N and refrigerant pressure sensor terminal B
― Between climate control unit terminal K and refrigerant pressure sensor terminal C
• Is there any open or short circuit detected?
Yes
Repair or replace for open or short circuit then go to Step 23.
No
Replace the refrigerant pressure sensor then go to Step 23.
(See REFRIGERANT PRESSURE SENSOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
17
INSPECT TO SEE WHETHER MALFUNCTION IS IN BCM OR REFRIGERANT PRESSURE SIGNAL WIRING HARNESS
• Inspect for open or short circuit between climate control unit terminal T (24-pin) and BCM terminal 3J.
• Is there any open or short circuit detected?
Yes
Repair or replace for open or short circuit then go to Step 23.
No
Replace the BCM then go to Step 23.
(BCM can not receive the refrigerant pressure signal from climate control unit or transmit it to PCM.)
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
18
INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY OR A/C MAGNETIC CLUTCH
• Start the engine and idle it.
• Verify that the A/C relay operation sound is heard while PCM PID ACCS to ON from OFF using the M-MDS simulation function.
• Is the A/C relay operation sound heard?
Yes
Go to the next step.
No
Go to Step 21.
19
INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C MAGNETIC CLUTCH OR ELSEWHERE
• Test voltage at the following terminal of magnetic clutch thermal protector.
― Terminal A (magnetic clutch operation signal)
• Is voltage approx. 12 V?
Yes
Go to the next step.
No
Go to Step 21.
20
INSPECT MAGNETIC CLUTCH CLEARANCE
• Inspect the magnetic clutch clearance. (See MAGNETIC CLUTCH ADJUSTMENT [MANUAL AIR CONDITIONER].)
• Is the magnetic clutch clearance normal?
Yes
Inspect and repair the magnetic clutch, then go to Step 23.
(See MAGNETIC CLUTCH INSPECTION [MANUAL AIR CONDITIONER].)
No
Adjust the magnetic clutch clearance, then go to Step 23.
(See MAGNETIC CLUTCH ADJUSTMENT [MANUAL AIR CONDITIONER].)
21
INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY OR RELATED WIRING HARNESS
• Inspect the A/C relay. (See RELAY INSPECTION [L3 Turbo].) (See RELAY INSPECTION [MZR-CD 2.2].) (See RELAY INSPECTION [L5].)
• Is the A/C relay normal?
Yes
Go to the next step.
No
Replace the A/C relay then go to Step 23.
22
INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY CONTROL CIRCUIT OR POWER SUPPLY CIRCUIT
• Remove the A/C relay.
• Start the engine and idle it.
• Measure the A/C relay terminal (fuse box side connector) while PCM PID ACCS to ON from OFF using the M-MDS simulation function.
• Is the voltage below 1.0 V?
Yes
Inspect and repair for open circuit between ignition switch terminal B and A/C relay terminal A then go to the next step.
No
Inspect and repair for open or short to power supply circuit between PCM terminal 1I and A/C relay terminal E then go to the next step.
23
CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR
• Does cool air blow out? (Are the results of refrigerant system performance test okay?)
Yes
Troubleshooting completed. Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.