LR3/Disco 3
NOTE :
Automatic Temperature Control (ATC) Module - C1630
9V, depending on
battery voltage
control panel
(Discovery 3 only)
20
LIN bus
9600 bps signal
when ATC module
panel on. Average
signal approximately
9V, depending on
battery voltage
None
99A2
Faulty air
distribution and
temperature control
from rear A/C
control panel
(Discovery 3 only)
Input/Output
Short circuit to
12V
21
Medium speed
CAN bus low
n/a
U1A1449
9959,
see
Note
below
ATC module
inoperative
Output
CAN
initialisation
failure - open
circuit
21
Medium speed
CAN bus low
n/a
U030055
9959,
see
Note
below
ATC module
inoperative
Output
CAN
configuration
failure - short
circuit to ground
21
Medium speed
CAN bus low
n/a
U007388
9959,
see
Note
below
ATC module
inoperative
Output
CAN bus off -
short circuit to
12V
22
Medium speed
CAN bus high
n/a
U1A1449
9959,
see
Note
below
ATC module
inoperative
Output
CAN
initialisation
failure - open
circuit
22
Medium speed
CAN bus high
n/a
U030055
9959,
see
Note
below
ATC module
inoperative
Output
CAN
configuration
failure - short
circuit to ground
22
Medium speed
CAN bus high
n/a
U007388
9959,
see
Note
below
ATC module
inoperative
Output
CAN bus off -
short circuit to
12V
23
Compressor
solenoid valve -
0.75A at maximum
compressor
displacement
generating a voltage
of 0.25V at this point
None
None
Poor climate
control, reduced air
flow into cabin,
possible engine
mis-fire
Output
Compressor
solenoid or
wiring fault can
cause incorrect
signal
24
Compressor
solenoid valve +
400Hz PWM signal
switching to battery
voltage
B1A7001
99AB
Poor climate
control, reduced air
flow into cabin,
possible engine
mis-fire
Output
Short circuit to
ground
PID 9959 is an illumination PWM value that is read as a CAN signal.
