NISSAN TIIDA 2007 Service Repair Manual

HAC-268
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
PTC HEATER CONTROL SYSTEM
 PTC heater
PTC relays
 Ambient sensor
 Blower relay
System Operation
PTC heater system starts when all the following conditions are met:
 Less than 35 minutes after ignition switch ON.
 Blower control dial ON (Blower motor operates.)
 Ambient temperature is lower than 0°C (32°F).
 Engine coolant temperature is lower than 65°C (149°F) (condition
1), or when it becomes lower than 60°C (140°F) again (condition 2)
on startup.
 Engine speed is more than 1100 rpm and after a lapse of more
than 10 seconds.
PTC heater system stops when any of the following conditions is
met:
 More than 35 minutes later after ignition switch ON.
 Fan control dial OFF (Blower motor OFF).
 Ambient temperature is higher than 0°C (32°F).
 Engine coolant temperature is higher than 65°C (149°F).
 When engine speed becomes less than 800 rpm.
PTC HEATER (1500 WATT) : Component DescriptionINFOID:0000000001679706
COMPONENT DESCRIPTION
PTC Control Unit
SJIA0968E
ALIIA0133GB

PTC HEATER CONTROL SYSTEM
HAC-269
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
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The PTC control unit is attached on the A/C unit assembly. It controls
PTC heater by ambient temperature, and FAN ON signal.
PTC Heater
The PTC heater is attached on the A/C unit assembly. It generates
heat electrically.
Ambient Sensor
The ambient sensor is attached on the radiator core support upper. It
detects ambient temperature and converts it into a resistance value
which is then input into the PTC control unit.
PTC HEATER (1500 WATT) : PTC Heater (1500 Watt) Diagnosis Procedure
INFOID:0000000001679707
DIAGNOSTIC PROCEDURE FOR PTC SYSTEM
SYMPTOM: PTC heater system operation is malfunction.
1.CHECK POWER SUPPLY FOR BLOWER RELAY
1. Turn ignition switch ON.
2. Disconnect blower relay.
3. Check voltage between blower relay harness connector J-1 ter-
minals 1, 5, and ground.
Is the inspection result normal
YES >> GO TO 2.
NO >> Repair harness or connector.
SJIA0906E
ALIIA0132ZZ
AWIIA0600ZZ
Te r m i n a l s
Vo l ta g e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
Blower relay: J-11
5
WJIA1783E

HAC-270
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
PTC HEATER CONTROL SYSTEM
2.CHECK BLOWER RELAY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between blower relay harness connector J-1
terminal 2 and ground.
Is the inspection result normal
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK BLOWER RELAY
1. Turn ignition switch OFF.
2. Check blower relay. Refer to XX-XX, "*****"
.
Is the inspection result normal
YES >> GO TO 4.
NO >> Replace blower relay.
4.CHECK POWER SUPPLY FOR PTC RELAY-1
1. Turn ignition switch OFF.
2. Reconnect blower relay.
3. Turn ignition switch ON.
4. Check voltage between PTC relay-1 harness connector E61 ter-
minals 2, 3, and ground.
Is the inspection result normal
YES >> GO TO 5.
NO >> Check power supply circuit and 10A and 40A fuse (No. 16 and I, located in the fuse block).
Refer to XX.
 If fuses are OK, check harness for open circuit. Repair or replace if necessary.
 If fuses are NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
5.CHECK POWER SUPPLY FOR PTC RELAY-2
Check voltage between PTC relay-2 harness connector E62 termi-
nals 2, 3, and ground.
Is the inspection result normal
YES >> GO TO 6.
NO >> Check power supply circuit and 80A fuse (N, located in the fuse block). Refer to XX.
 If fuses are OK, check harness for open circuit. Repair or replace if necessary.
 If fuses are NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
Connector Terminal
GroundContinuity
Blower relay: J-1 2 Yes
WJIA2264E
Te r m i n a l s
Voltag e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
PTC relay-2: E612
3
AWIIA0466ZZ
Te r m i n a l s
Voltag e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
PTC relay-2: E622
3
AWIIA0466ZZ

PTC HEATER CONTROL SYSTEM
HAC-271
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
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6.CHECK POWER SUPPLY FOR PTC RELAY-3
Check voltage between PTC relay-3 harness connector E61 termi-
nals 2, 3, and ground.
Is the inspection result normal
YES >> GO TO 5.
NO >> Check power supply circuit and 80A fuse (P, located in the fuse block). Refer to XX-XX.
 If fuses are OK, check harness for open circuit. Repair or replace if necessary.
 If fuses are NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
7.CHECK PTC RELAYS
1. Turn ignition switch OFF.
2. Check PTC relay. Refer to XX-XX, "*****"
.
Is the inspection result normal
YES >> GO TO 6.
NO >> Replace inoperative PTC relay.
8.CHECK PTC RELAY-1 GROUND CIRCUIT
1. Disconnect ambient sensor, and PTC heater connectors.
2. Turn temperature control dial clockwise until full hot position.
3. Turn mode control dial to foot position.
4. Start the engine (1,000 RPM minimum).
5. Turn blower control dial to low speed.
6. Check continuity between PTC relay-1 harness connector E61
terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 10.
NO >> GO TO 9.
9.CHECK CIRCUIT CONTINUITY BETWEEN PTC RELAY-1 AND BCM
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between PTC relay-1 harness connector E61
(A) terminal 1 and BCM harness connector M19 (B) terminal 64.
Is the inspection result normal
YES >> Replace BCM. Refer to XXXX.
NO >> Repair harness or connector.
10.CHECK PTC RELAY-2 GROUND CIRCUIT
Te r m i n a l s
Vo l ta g e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
PTC relay-3: E632
3
AWIIA0466ZZ
Connector Terminal
GroundContinuity
PTC relay-1: E61 1 Yes
AWIIA0455ZZ
AB
Continuity
Connector Terminal Connector Terminal
PTC relay-1: E61 1 BCM: M19 64 Yes
AWIIA0467ZZ

HAC-272
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
PTC HEATER CONTROL SYSTEM
Check continuity between PTC relay-2 harness connector E62 termi-
nal 1 and ground.
Is the inspection result normal
YES >> GO TO 12.
NO >> GO TO 11.
11 .CHECK CIRCUIT CONTINUITY BETWEEN PTC RELAY-2 AND BCM
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between BCM harness connector M19 (B) ter-
minal 52 and PTC relay-1 harness connector E62 (A) terminal 1.
Is the inspection result normal
YES >> Replace BCM. Refer to XXXX.
NO >> Repair harness or connector.
12.CHECK PTC RELAY-3 GROUND CIRCUIT
Check continuity between PTC relay-3 harness connector E63 termi-
nal 1 and ground.
Is the inspection result normal
YES >> GO TO 14.
NO >> GO TO 13.
13.CHECK CIRCUIT CONTINUITY BETWEEN PTC RELAY-3 AND BCM
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between BCM harness connector M19 (B) ter-
minal 51 and PTC relay-3 harness connector E63 (A) terminal 1.
Is the inspection result normal
YES >> GO TO 14.
NO >> Repair harness or connector.
14.CHECK VOLTAGE BETWEEN AMBIENT TEMPERATURE SENSOR AND GROUND
Connector Terminal
GroundContinuity
PTC relay-2: E62 1 Yes
AWIIA0455ZZ
AB
Continuity
Connector Terminal Connector Terminal
PTC relay-2: E62 1 BCM: M19 52 Yes
AWIIA0468ZZ
Connector Terminal
GroundContinuity
PTC relay-3: E63 1 Yes
AWIIA0455ZZ
AB
Continuity
Connector Terminal Connector Terminal
PTC relay-3: E63 1 BCM: M19 51 Yes
AWIIA0469ZZ

PTC HEATER CONTROL SYSTEM
HAC-273
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
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1. Turn ignition switch OFF.
2. Reconnect BCM connector.
3. Disconnect ambient temperature sensor.
4. Turn ignition switch ON.
5. Check voltage between ambient temperature sensor harness
connector E60 terminal 4 and ground.
Is the inspection result normal
YES >> GO TO 16.
NO >> GO TO 15.
15.CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT TEMPERATURE SENSOR AND BCM CONTROL
UNIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between ambient temperature sensor harness
connector E60 (A) terminal 4 and BCM harness connector M18
(B) terminal 36.
4. Check continuity between ambient temperature sensor harness
connector E60 (A) terminal 4 and ground.
Is the inspection result normal
YES >> Replace BCM. Refer to XXXX.
NO >> Repair harness or connector.
16.CHECK CONTINUITY OF AMBIENT TEMPERATURE SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between ambient temperature sensor harness
connector E60 (A) terminal 3 and BCM harness connector M18
(B) terminal 35.
Is the inspection result normal?
YES >> GO TO 17.
NO >> Repair harness or connector.
17.CHECK AMBIENT TEMPERATURE SENSOR
Te r m i n a l s
Vo l ta g e
(Approx.) (+) (−)
Connector Terminal
Ground
Ambient temperature sensor:
E6045V
AWIIA0462ZZ
AB
Continuity
Connector Terminal Connector Terminal
Ambient temperature
sensor: E604BCM: M1836Yes
A
GroundContinuity
Connector Terminal
Ambient temperature sensor: E60 4 No
AWIIA0470ZZ
AB
Continuity
Connector Terminal Connector Terminal
Ambient temperature
sensor: E643BCM: M1835Yes
AWIIA0471ZZ

HAC-274
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
PTC HEATER CONTROL SYSTEM
Refer to XX-XX, "*****".
Is the inspection result normal?
YES >> GO TO 18.
NO >> Replace ambient temperature sensor. Refer to XX.
18.CHECK PTC HEATER RELAY-1 POWER SUPPLY CIRCUIT
1. Disconnect PTC heater connector.
2. Reconnect all PTC relays.
3. Start the engine (1,000 RPM minimum).
4. Check voltage between PTC heater harness connector E65 ter-
minal 3 and ground.
Is the inspection result normal?
YES >> GO TO 19.
NO >> Repair harness or connector.
19.CHECK PTC HEATER RELAY-2 POWER SUPPLY CIRCUIT
Check voltage between PTC heater harness connector E65 terminal
2 and ground.
Is the inspection result normal
YES >> GO TO 20.
NO >> Repair harness or connector.
20.CHECK PTC HEATER RELAY-3 POWER SUPPLY CIRCUIT
Check voltage between PTC heater harness connector E65 terminal
1 and ground.
Is the inspection result normal
YES >> Replace PTC heater. Refer to XXXX.
NO >> Repair harness or connector.
PTC HEATER (1500 WATT) : PTC Heater (1500 Watt) Component Inspection
INFOID:0000000001679708
COMPONENT INSPECTION
Blower Relay
Te r m i n a l s
Vol tag e
(Approx.) (+) (−)
Connector Terminal
Ground
PTC heater: E65 3 Battery voltage
AWIIA0472ZZ
Te r m i n a l s
Vol tag e
(Approx.) (+) (−)
Connector Terminal
Ground
PTC heater: E65 2 Battery voltage
AWIIA0474ZZ
Te r m i n a l s
Vol tag e
(Approx.) (+) (−)
Connector Terminal
Ground
PTC heater: E65 1 Battery voltage
AWIIA0476ZZ

PTC HEATER CONTROL SYSTEM
HAC-275
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Check continuity between relay terminals 3 and 5.
If NG, replace the blower relay. Refer to XX.
PTC relay
Check continuity between terminal Nos. 3 and 5.
If NG, replace PTC relay. Refer to XX.
Ambient Sensor
After disconnecting ambient sensor connector E60, measure resis-
tance between terminals 3 and 4 at sensor side, using the table
below.
Condition Continuity
12V direct current supply between terminals 1 and 2 Yes
OFF No
SCIA1245E
Condition Continuity
12V direct current supply between terminal Nos. 1 and 2 Yes
No current supply No
SJIA0931E
Temperature °C (°F) Resistance kΩ
−15 (5) 12.73
−10 (14) 9.92
−5 (23) 7.80
0 (32) 6.19
5 (41) 4.95
10 (50) 3.99
15 (59) 3.24
20 (68) 2.65
25 (77) 2.19
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27
45 (113) 1.07
AWIIA0601ZZ

HAC-276
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
PTC HEATER CONTROL SYSTEM
If NG, replace ambient sensor. Refer to XX.

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
HAC-277
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POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
Component DescriptionINFOID:0000000001547368
COMPONENT DESCRIPTION
Front air control
The front air control has a built-in microcomputer which processes information sent from various sensors
needed for air conditioner operation. The air mix door motor, mode door motor, intake door motor, blower
motor and compressor are then controlled.
The front air control is unitized with control mechanisms. Signal from various switches and Potentio Tempera-
ture Control (PTC) are directly entered into front air control
Self-diagnostic functions are also built into front air control to provide quick check of malfunctions in the auto
air conditioner system.
Potentio Temperature Control (PTC)
The PTC is built into the front air control It can be set at an interval of
1°C (34°F) in the 18°C (64°F) to 32°C (90°F) temperature range by
turning temperature control switch. The set temperature is displayed.
A/C Auto Amp. Component Function CheckINFOID:0000000001547369
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - AUTO MODE
1. Rotate the mode dial to the AUTO position.
2. Display should indicate AUTO. Confirm that the compressor clutch engages (sound or visual inspection).
(Discharge air and blower speed will depend on ambient, in-vehicle and set temperatures.)
Can a symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to HAC-202, "
Operational Check".
Can a symptom be duplicated?
YES >> Refer to HAC-201, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK POWER AND GROUND CIRCUIT
Check main power supply and ground circuit. Refer to HAC-278, "
A/C Auto Amp Power and Ground Diagnosis
Procedure".
Is the inspection result normal?
YES >> System OK.
NO >> Replace Front air control. Refer to XXXX.
SJIA0876E