1999 NISSAN PRIMERA Electronic Repair Manual

Page 1937 of 2267

NISSAN PRIMERA 1999  Electronic Repair Manual system operation. On the other hand, shortly after entering a
long tunnel, the system will recognize the change in sunload, and
the system will react accordingly.
SUNLOAD COMPENSATION
The auto amplifi

Page 1938 of 2267

NISSAN PRIMERA 1999  Electronic Repair Manual A/C SWITCH COMPENSATION
The auto amplifier alters the air mix door position and air flow volume according to a signal emitted from the
A/C switch.
When the A/C switch is ªONº, the auto amplifier com

Page 1939 of 2267

NISSAN PRIMERA 1999  Electronic Repair Manual Control System Output Components
AIR MIX DOOR CONTROL (Automatic temperature control)
Component parts
Air mix door control system components are:
1) Auto amplifier
2) Ambient sensor
3) In-vehicle sens

Page 1940 of 2267

NISSAN PRIMERA 1999  Electronic Repair Manual Air mix door control specifications
SENSOR INPUT PROCESS
The auto amplifier detects the voltage produced by each sensor,
the PBR and fixed resistor. The fixed resistor is built into the auto
amplifier

Page 1941 of 2267

NISSAN PRIMERA 1999  Electronic Repair Manual OPERATION OF AIR MIX DOOR MOTOR
lExamplep1
When the temperature in the vehicle is lower than the set
temperature.
When the temperature in the vehicle is low, in-vehicle sen-
sor resistance is great an

Page 1942 of 2267

NISSAN PRIMERA 1999  Electronic Repair Manual lExamplep2
When the temperature in the vehicle is higher than the set
temperature.
When the temperature in the vehicle is high, in-vehicle sen-
sor resistance is small and the input voltage to the aut

Page 1943 of 2267

NISSAN PRIMERA 1999  Electronic Repair Manual 21Air mix door
operationDirection of lever movement
!@COLD,HOTClockwise
(Toward passenger compartment)
Ð Ð STOPSTOP
@
!HOT,COLDCounterclockwise
(Toward engine compartment)
PBR
Measure voltage betwee

Page 1944 of 2267

NISSAN PRIMERA 1999  Electronic Repair Manual FAN SPEED CONTROL
Component parts
Fan speed control system components are:
1) Auto amplifier
2) In-vehicle sensor
3) Ambient sensor
4) Sunload sensor
5) A/C switch relay
6) A/C switch
7) Fan switch
8)