LR3/Disco 3
NOTE :
power
awake
in sleep mode
14
LIN bus
9600 bps signal
when ATC module
panel on. Average
signal
approximately 9V,
depending on
battery voltage
B1B7400,
B1B7500,
B1B7600,
B1B7700
9991,
9992,
9993,
9994
Most actuators
don't work, rear
A/C control
panel
inoperative
(Discovery 3
only)
Input/Output Open circuit
14
LIN bus
9600 bps signal
when ATC module
panel on. Average
signal
approximately 9V,
depending on
battery voltage
B1B7400,
B1B7500,
B1B7600,
B1B7700,
B1B8200,
B1B8300,
B1B7088
9991,
9992,
9993,
9994
Most actuators
don't work, rear
A/C control
panel
inoperative
(Discovery 3
only)
Input/Output
Short circuit to
ground
15
Cavity not used n/a
n/a
n/a
n/a
n/a
n/a
16
Cavity not used n/a
n/a
n/a
n/a
n/a
n/a
17
Blower motor
power
Varies between
1.5V and 2.8V
according to blower
setting
None
9938
Blower motor
inoperative
Output
Short circuit to
ground, open
circuit
17
Blower motor
power
Varies between
1.5V and 2.8V
according to blower
setting
None
9938
Blower motor
always running
at max. speed
when A/C
switched on
Output
Short circuit high
18
Blower motor
voltage sense
Blower setting 2 will
give 6.3V, setting 4
will give 3.3V when
battery voltage is
13.5V
None
9938
Blower motor
inoperative
Input
Short circuit to
ground
18
Blower motor
voltage sense
Blower setting 2 will
give 6.3V, setting 4
will give 3.3V when
battery voltage is
13.5V
None
9938
Blower motor
always running
at max. speed
when A/C
switched on
Input
Open circuit,
short circuit high
19
Cavity not used n/a
n/a
n/a
n/a
n/a
n/a
20
Evaporator
temperature
sensor signal
Sensor resistance
at 25°C is 1.5k
ohms. Pull up
resistance is 5.62k
ohms
B1B7111
995A
A/C inoperative.
Possible engine
misfire
Input
Short circuit to
ground
20
Evaporator
temperature
sensor signal
Sensor resistance
at 25°C is 1.5k
ohms. Pull up
resistance is 5.62k
ohms
B1B7115
995A
A/C inoperative.
Possible engine
misfire
Input
Open circuit,
short circuit high
21
Cavity not used n/a
n/a
n/a
n/a
n/a
n/a
22
Cavity not used n/a
n/a
n/a
n/a
n/a
n/a
23
Cavity not used n/a
n/a
n/a
n/a
n/a
n/a
24
Sensor supply
5V ± 0.25V (C2655-
12)
B1A5911
None
Air intake stuck
in one position.
A/C system
inoperative
Output
Short circuit to
ground
24
Sensor supply
5V ± 0.25V (C2655-
12)
B1B6013
None
Air intake stuck
in one position
Output
Open circuit
Also check for mechanical causes of flap malfunction.
