LR3/Disco 3
4
Refrigerant
pressure sensor
signal
0.5V at zero
pressure rising to
4.8V at
approximately
3.2MPa when 5V
seen at C2655-1
B1A6211
9990
Compressor not
running, no cooling
available
Input
Short circuit to
ground
5
RH sunlight
sensor signal
0V in darkness/low
light rising to 5V in
bright sunlight.
Should never
exceed 5V (C1629-
13)
None
9962
No solar
compensation,
customer too hot in
sunlight
Input
Open circuit,
short circuit to
ground
5
RH sunlight
sensor signal
0V in darkness/low
light rising to 5V in
bright sunlight.
Should never
exceed 5V (C1629-
13)
B1A6312
9962
Maximum solar
compensation,
blower level too
high
Input
Short circuit to
5V
6
Cavity not used n/a
n/a
n/a
n/a
n/a
n/a
7
Blower relay
coil
<1V with ignition
and ATC module
panel on
None
99A2
Blower runs
continuously
Output
Short circuit to
ground
7
Blower relay
coil
<1V with ignition
and ATC module
panel on
None
99A2
Blower inoperative Output
Open circuit,
short to 12V
8
Cavity not used n/a
n/a
n/a
n/a
n/a
n/a
9
Medium speed
CAN bus low
n/a
U1A1449
9959,
see
Note
below
ATC module does
not work
Input
CAN
initialisation
failure - open
circuit
9
Medium speed
CAN bus low
n/a
U030055
9959,
see
Note
below
ATC module does
not work
Input
CAN
configuration
failure - short
circuit to ground
9
Medium speed
CAN bus low
n/a
U007388
9959,
see
Note
below
ATC module does
not work
Input
CAN bus off -
short circuit to
12V
10
Medium speed
CAN bus high
n/a
U1A1449
9959,
see
Note
below
ATC module does
not work
Input
CAN
initialisation
failure - open
circuit
10
Medium speed
CAN bus high
n/a
U030055
9959,
see
Note
below
ATC module does
not work
Input
CAN
configuration
failure - short
circuit to ground
10
Medium speed
CAN bus high
n/a
U007388
9959,
see
Note
below
ATC module does
not work
Input
CAN bus off -
short circuit to
12V
11
Pollution sensor
supply
Battery voltage
when rear A/C
control panel on. 0V
when panel in sleep
mode
B1B7015
99A2
Pollution sensor
and rear A/C
control panel
inoperative
(Discovery 3 only)
Output
Open circuit
11
Pollution sensor
supply
Battery voltage
when rear A/C
control panel on. 0V
when panel in sleep
mode
B1B7311
99A2
Pollution sensor
and rear A/C
control panel
inoperative
(Discovery 3 only)
Output
Short circuit to
ground
