Nissan Pathfinder. Manual — part 685

HAC-1

VENTILATION, HEATER & AIR CONDITIONER

C

D

E

F

G

H

J

K

L

M

SECTION

HAC

A

B

HAC

N

O

P

CONTENTS

HEATER & AIR CONDITIONING CONTROL SYSTEM

AUTOMATIC AIR CONDITIONING

PRECAUTION . . . . . . . . . . . ...

5

PRECAUTIONS . . . . . . . . . . . . ...

5

Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" . . . . . . . . . . . . . . . . ...

5

Precautions For Refrigerant System Service . . ....

5

Precaution for Service Equipment . . . . . . .....

8

PREPARATION . . . . . . . . . . ...

10

PREPARATION . . . . . . . . . . . . ..

10

Special Service Tool . . . . . . . . . . . ...

10

Commercial Service Tool . . . . . . . . . .

10

SYSTEM DESCRIPTION . . . . . . . .

11

COMPONENT PARTS . . . . . . . . . ...

11

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM . . . . . . . . . . . . . . . . . . .

11

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Component Parts Location . . . . . . ...

11

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Component Description . . . . . . . .

12

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM . . . . . . . . . . . . . . . . . . .

14

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Component Parts Location . . . . . . ...

15

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Component Description . . . . . . . .

16

SYSTEM . . . . . . . . . . . . . . . .

18

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM . . . . . . . . . . . . . . . . . . .

18

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : System Diagram . . . . . . . . . . ...

18

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : System Description . . . . . . . . . ...

18

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Intelligent Key Interlock Function . . . . ..

19

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Air Flow Control . . . . . . . . . . .

20

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Air Inlet Control . . . . . . . . . . . .

21

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Air Outlet Control . . . . . . . . . . ..

21

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Compressor Control . . . . . . . . . ..

22

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Door Control . . . . . . . . . . . . ..

23

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Temperature Control . . . . . . . . . .

25

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Fail-safe . . . . . . . . . . . . . .

25

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM . . . . . . . . . . . . . . . . . . .

25

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : System Diagram . . . . . . . . . . ...

26

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : System Description . . . . . . . . . ...

26

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Intelligent Key Interlock Function . . . . ..

27

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Air Flow Control . . . . . . . . . . .

28

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Air Outlet Control . . . . . . . . . . ..

29

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Door Control . . . . . . . . . . . . ..

29

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Temperature Control . . . . . . . . . .

30

OPERATION . . . . . . . . . . . . . .

31

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM . . . . . . . . . . . . . . . . . . .

31

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Switch Name and Function . . . . . . ...

31

HAC-2

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM . . . . . . . . . . . . . . . . . . ...

35

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Switch Name and Function . . . . . . ..

35

DIAGNOSIS SYSTEM (HVAC) . . . . . . ..

39

Description . . . . . . . . . . . . . . . ..

39

CONSULT Function . . . . . . . . . . . ....

39

ECU DIAGNOSIS INFORMATION . . . ..

42

A/C AUTO AMP. . . . . . . . . . . . .

42

Reference Value . . . . . . . . . . . . . .

42

Fail-safe . . . . . . . . . . . . . . . . ..

46

DTC Index . . . . . . . . . . . . . . . ..

46

ECM, IPDM E/R, BCM . . . . . . . . . ...

48

List of ECU Reference . . . . . . . . . . ....

48

WIRING DIAGRAM . . . . . . . . . .

49

AUTOMATIC AIR CONDITIONING SYSTEM ...

49

Wiring Diagram . . . . . . . . . . . . . ...

49

BASIC INSPECTION . . . . . . . . ...

70

DIAGNOSIS AND REPAIR WORK FLOW . .

70

Work Flow . . . . . . . . . . . . . . . ...

70

OPERATION INSPECTION . . . . . . . ...

73

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM . . . . . . . . . . . . . . . . . . ...

73

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Work Procedure . . . . . . . . . . ...

73

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM . . . . . . . . . . . . . . . . . . ...

74

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Work Procedure . . . . . . . . . . ...

75

SYSTEM SETTING . . . . . . . . . . .

78

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM . . . . . . . . . . . . . . . . . . ...

78

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Temperature Setting Trimmer (Front) . . ..

78

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Foot Position Setting Trimmer . . . . . .

78

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Inlet Port Memory Function (FRE) . . . ...

79

FRONT AUTOMATIC AIR CONDITIONING SYS-
TEM : Inlet Port Memory Function (REC) . . . ...

79

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM . . . . . . . . . . . . . . . . . . ...

79

REAR AUTOMATIC AIR CONDITIONING SYS-
TEM : Temperature Setting Trimmer (Rear) . . ...

79

DTC/CIRCUIT DIAGNOSIS . . . . . . .

81

U1000 CAN COMM CIRCUIT . . . . . . .

81

Description . . . . . . . . . . . . . . . ..

81

DTC Logic . . . . . . . . . . . . . . . ...

81

Diagnosis Procedure . . . . . . . . . . . ...

81

U1010 CONTROL UNIT (CAN) . . . . . . .

82

Description . . . . . . . . . . . . . . . ..

82

DTC Logic . . . . . . . . . . . . . . . ...

82

Diagnosis Procedure . . . . . . . . . . . ...

82

B2578, B2579 IN-VEHICLE SENSOR . . . ..

83

DTC Logic . . . . . . . . . . . . . . . ...

83

Diagnosis Procedure . . . . . . . . . . . ...

83

Component Inspection . . . . . . . . . . .

84

B257B, B257C AMBIENT SENSOR . . . . .

86

DTC Logic . . . . . . . . . . . . . . . ...

86

Diagnosis Procedure . . . . . . . . . . . ...

86

Component Inspection . . . . . . . . . . .

87

B2581, B2582 INTAKE SENSOR . . . . . .

89

DTC Logic . . . . . . . . . . . . . . . ...

89

Diagnosis Procedure . . . . . . . . . . . ...

89

Component Inspection . . . . . . . . . . .

90

B2630, B2631 SUNLOAD SENSOR . . . . .

92

DTC Logic . . . . . . . . . . . . . . . ...

92

Diagnosis Procedure . . . . . . . . . . . ...

92

Component Inspection . . . . . . . . . . .

93

B2632, B2633 AIR MIX DOOR MOTOR
(DRIVER SIDE) . . . . . . . . . . . . ..

95

DTC Logic . . . . . . . . . . . . . . . ...

95

Diagnosis Procedure . . . . . . . . . . . ...

95

B2634, B2635 AIR MIX DOOR MOTOR (PAS-
SENGER SIDE) . . . . . . . . . . . . .

97

DTC Logic . . . . . . . . . . . . . . . ...

97

Diagnosis Procedure . . . . . . . . . . . ...

97

B2636, B2637, B2638, B2639, B2654 MODE
DOOR MOTOR (FRONT) . . . . . . . . ..

99

DTC Logic . . . . . . . . . . . . . . . ...

99

Diagnosis Procedure . . . . . . . . . . . ...

99

B263D, B263E, B263F INTAKE DOOR MO-
TOR . . . . . . . . . . . . . . . . ...

101

DTC Logic . . . . . . . . . . . . . . . .

101

Diagnosis Procedure . . . . . . . . . . . .

101

B2799, B279A AIR MIX DOOR MOTOR
(REAR) . . . . . . . . . . . . . . . ..

103

DTC Logic . . . . . . . . . . . . . . . .

103

Diagnosis Procedure . . . . . . . . . . . .

103

B279B, B279C MODE DOOR MOTOR
(REAR) . . . . . . . . . . . . . . . ..

105

DTC Logic . . . . . . . . . . . . . . . .

105

Diagnosis Procedure . . . . . . . . . . . .

105

B279D, B279E REAR SHUT-OFF DOOR MO-
TOR . . . . . . . . . . . . . . . . ...

107

DTC Logic . . . . . . . . . . . . . . . .

107

HAC-3

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Diagnosis Procedure . . . . . . . . . . . .

107

B2796, B2797, B2798 COMMUNICATION
ERROR . . . . . . . . . . . . . . . .

109

DTC Logic . . . . . . . . . . . . . . . .

109

Diagnosis Procedure . . . . . . . . . . . .

109

B27B0 A/C AUTO AMP. . . . . . . . . ..

111

DTC Logic . . . . . . . . . . . . . . . .

111

Diagnosis Procedure . . . . . . . . . . . .

111

POWER SUPPLY AND GROUND CIRCUIT .

112

A/C AUTO AMP. . . . . . . . . . . . . . ..

112

A/C AUTO AMP. : Diagnosis Procedure . . . ...

112

AIR MIX DOOR MOTOR (DRIVER SIDE) . . . ...

112

AIR MIX DOOR MOTOR (DRIVER SIDE) : Diag-
nosis Procedure . . . . . . . . . . . . .

112

AIR MIX DOOR MOTOR (PASSENGER SIDE) . ..

113

AIR MIX DOOR MOTOR (PASSENGER SIDE) :
Diagnosis Procedure . . . . . . . . . . . .

113

AIR MIX DOOR MOTOR (REAR) . . . . . . .

114

AIR MIX DOOR MOTOR (REAR) : Diagnosis Pro-
cedure . . . . . . . . . . . . . . . . ...

114

MODE DOOR MOTOR (FRONT) . . . . . . . .

115

MODE DOOR MOTOR (FRONT) : Diagnosis Pro-
cedure . . . . . . . . . . . . . . . . ...

115

MODE DOOR MOTOR (REAR) . . . . . . . ...

116

MODE DOOR MOTOR (REAR) : Diagnosis Pro-
cedure . . . . . . . . . . . . . . . . ...

116

INTAKE DOOR MOTOR . . . . . . . . . . ..

117

INTAKE DOOR MOTOR : Diagnosis Procedure ...

117

A/C SWITCH ASSEMBLY . . . . . . . . . ...

118

A/C SWITCH ASSEMBLY : Component Function
Check . . . . . . . . . . . . . . . . .

118

A/C SWITCH ASSEMBLY : Diagnosis Procedure ..

119

A/C DISPLAY UNIT . . . . . . . . . . . . .

119

A/C DISPLAY UNIT : Diagnosis Procedure . . ..

119

REAR SHUT-OFF DOOR MOTOR . . . . . . ..

120

REAR SHUT-OFF DOOR MOTOR : Diagnosis
Procedure . . . . . . . . . . . . . . . ..

120

REAR A/C CONTROL . . . . . . . . . . . .

121

REAR A/C CONTROL : Diagnosis Procedure . ..

121

A/C SWITCH ASSEMBLY SIGNAL CIRCUIT ..

123

Diagnosis Procedure . . . . . . . . . . . .

123

A/C DISPLAY . . . . . . . . . . . . ...

125

Diagnosis Procedure . . . . . . . . . . . .

125

DOOR MOTOR . . . . . . . . . . . . .

126

Diagnosis Procedure . . . . . . . . . . . .

126

DOOR MOTOR COMMUNICATION CIRCUIT ..

128

Diagnosis Procedure . . . . . . . . . . . .

128

FRONT BLOWER MOTOR . . . . . . . .

130

Diagnosis Procedure . . . . . . . . . . . .

130

Component Inspection (Front Blower Motor) . . .

131

Component Inspection (Front Blower Motor Re-
lay) . . . . . . . . . . . . . . . . . . .

131

MAGNET CLUTCH . . . . . . . . . . .

133

Component Function Check . . . . . . . . ..

133

Diagnosis Procedure . . . . . . . . . . . .

133

PTC HEATER RELAY . . . . . . . . . .

134

Description . . . . . . . . . . . . . . . .

134

Component Function Check . . . . . . . . ..

134

Diagnosis Procedure . . . . . . . . . . . .

134

Component Inspection . . . . . . . . . . ...

135

PTC HEATER . . . . . . . . . . . . ..

136

Diagnosis Procedure . . . . . . . . . . . .

136

REAR BLOWER MOTOR . . . . . . . ...

138

Diagnosis Procedure . . . . . . . . . . . .

138

Component Inspection (Rear Blower Motor) . . .

142

Component Inspection (Rear Blower Motor Relay)

..

142

Component Inspection (Rear Blower Motor Resis-
tor) . . . . . . . . . . . . . . . . . . .

142

SYMPTOM DIAGNOSIS . . . . . . .

144

FRONT AUTOMATIC AIR CONDITIONING
SYSTEM . . . . . . . . . . . . . . ..

144

Diagnosis Chart By Symptom . . . . . . . .

144

REAR AUTOMATIC AIR CONDITIONING
SYSTEM . . . . . . . . . . . . . . ..

146

Diagnosis Chart By Symptom . . . . . . . .

146

INSUFFICIENT COOLING . . . . . . . ..

147

FRONT AIR CONDITIONER . . . . . . . . .

147

FRONT AIR CONDITIONER : Description . . .

147

FRONT AIR CONDITIONER : Diagnosis Proce-
dure . . . . . . . . . . . . . . . . . ...

147

REAR AIR CONDITIONER . . . . . . . . . ..

148

REAR AIR CONDITIONER : Description . . . ..

148

REAR AIR CONDITIONER : Diagnosis Procedure

..

148

INSUFFICIENT HEATING . . . . . . . ...

149

FRONT AIR CONDITIONER . . . . . . . . .

149

FRONT AIR CONDITIONER : Description . . .

149

FRONT AIR CONDITIONER : Diagnosis Proce-
dure . . . . . . . . . . . . . . . . . ...

149

REAR AIR CONDITIONER . . . . . . . . . ..

149

REAR AIR CONDITIONER : Description . . . ..

150

REAR AIR CONDITIONER : Diagnosis Procedure

..

150

HAC-4

INTELLIGENT KEY INTERLOCK FUNCTION
DOES NOT OPERATE . . . . . . . . .

151

Description . . . . . . . . . . . . . . . .

151

Diagnosis Procedure . . . . . . . . . . . .

151

COMPRESSOR DOES NOT OPERATE . . .

152

Description . . . . . . . . . . . . . . . .

152

Diagnosis Procedure . . . . . . . . . . . .

152

REMOVAL AND INSTALLATION . . . ..

154

A/C ASSEMBLY SWITCH . . . . . . . ...

154

Removal and Installation - Without Navigation . ..

154

A/C AND AV SWITCH ASSEMBLY . . . .

155

Removal and Installation - With Navigation . . ...

155

REAR AIR CONTROL . . . . . . . . . .

156

Removal and Installation . . . . . . . . . ...

156

A/C AUTO AMP. . . . . . . . . . . . ..

157

Exploded View . . . . . . . . . . . . . ...

157

Removal and Installation . . . . . . . . . ...

157

AMBIENT SENSOR . . . . . . . . . . .

158

Removal and Installation . . . . . . . . . ...

158

IN-VEHICLE SENSOR . . . . . . . . . .

159

Removal and Installation . . . . . . . . . ...

159

SUNLOAD SENSOR . . . . . . . . . ...

160

Removal and Installation . . . . . . . . . ...

160

INTAKE SENSOR . . . . . . . . . . .

161

Removal and Installation . . . . . . . . . ...

161

REFRIGERANT PRESSURE SENSOR . . ...

162

Removal and Installation . . . . . . . . . ...

162

DOOR MOTOR . . . . . . . . . . . . .

163

Exploded View . . . . . . . . . . . . . ..

163

MODE DOOR MOTOR . . . . . . . . . . .

164

MODE DOOR MOTOR : Removal and Installation
- Mode Door Motor (Front) . . . . . . . . .

164

MODE DOOR MOTOR : Removal and Installation
- Mode Door Motor (Rear) . . . . . . . . . .

164

AIR MIX DOOR MOTOR . . . . . . . . . . .

165

AIR MIX DOOR MOTOR : Removal and Installa-
tion - Air Mix Door Motor (Driver Side) . . . . ..

165

AIR MIX DOOR MOTOR : Removal and Installa-
tion - Air Mix Door Motor (Passenger Side) . . ..

165

AIR MIX DOOR MOTOR : Removal and Installa-
tion - Air Mix Door Motor (Rear) . . . . . . .

165

INTAKE DOOR MOTOR . . . . . . . . . . .

165

INTAKE DOOR MOTOR : Removal and Installa-
tion . . . . . . . . . . . . . . . . . .

165

REAR SHUT-OFF DOOR MOTOR . . . . . . .

165

REAR SHUT-OFF DOOR MOTOR : Removal and
Installation . . . . . . . . . . . . . . . .

165

BLOWER MOTOR RESISTOR . . . . . .

167

Removal and Installation - Rear Blower Motor Re-
sistor 1 . . . . . . . . . . . . . . . . ..

167

Removal and Installation - Rear Blower Motor Re-
sistor 2 . . . . . . . . . . . . . . . . ..

167