|
No.
|
TECH 1 Display
|
Conditions for
Checking
|
Nominal Value
|
Trouble Codes
|
Terminal
|
|
|
12
|
A /C COMPRESS. SW
|
Ignition On
Engine running at idle speed, operating temperature
Ambient temperature higher than 20 °C / 68 °F
Vehicles with AC:
AC switch On
Vehicles without AC:
|
INACTIVE
0 V
INACTIVE
0 V
ACTIVE
12 V
INACTIVE
0 V
|
|
12, 19
|
|
|
Note: The lead to Ter. 12 in control unit
K69 is present in all vehicles but is open on the vehicle side in
vehicles without AC.
Vehicle interior should be warm, set thermostat
to "Cold", ventilation to full load; compressor switches on
automatically
In some vehicles, it is necessary to accelerate
briefly or to wait while until the compressor has built up pressure and
switches.
|
|
Notes on Trouble - shooting:
|
Nominal Value:
|
Cause of Fault:
|
|
|
Vehicles without AC:
· Using
multimeter, measure voltage at wiring harness plug
- X8 /
Ter. 4 (Astra - F)
- X11 /
Ter. 3 (Vectra / Cavalier, Calibre)
- X30 /
Ter. 2 (Omega - B)
to ground,
Ignition On.
Vehicles with AC:
|
0 V
|
· Short circuit
to + battery voltage
|
|
|
· Engine running
at idle speed, operating temperature.
Using multimeter, measure voltage at wiring harness
plug
X8 /
Ter. 4 (Astra - F)
X9 /
Ter. 3 (Vectra / Cavalier, Calibra)
X30 /
Ter. 2 (Omega - B)
to ground,
|
|
|
|
|
AC Off
AC On
(observe note)
|
0 V
12 V
Compressor switches on
|
· Fault in AC
switch - on circuit
· Lead has short
circuit to + battery voltage
· Fault in AC
switch - on circuit
· Short circuit
to ground or interruption in lead from control unit K69 / Ter. 12 via
wiring harness plug
- X8 (Astra -
F)
- X9 (Vectra /
Cavalier, Calibre)
- X30 (Omega -
B)
to compressor switch S109
|
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