Troubleshooting – BlueCool Truck Electrical System
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17
Webasto Product N.A., Inc.
™
Checking for battery voltage (constant) at control module connector.
Figure 16. Constant battery voltage at control module - charging mode
Checking for a 12 volt positive reference signal with the vehicle key ON or engine running
Figure 17. 12 volt positive reference signal to control module - charging mode
V DC
V
V
Volts DC
_
+
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Red 14GA - Constant Power Positive (Fused 10 amp.)
Brown 14GA - Constant Negative to all Components
Pink 16GA - 12V Positive Reference Signal to Control Module
Orange 14GA - 12V Switched Positive to Coolant Pump
Purple 16GA - 12V Switched Positive to Pressure Sensor (X6),
Ambient Thermostat (X7) and System Control Relay (X10)
Not Used
Black 20GA - Storage Core Digital Temperature Sensor
White 20GA - Storage Core Digital Temperature Sensor
Viewed from wire insertion side
LEGEND
X1
V DC
V
V
Volts DC
_
+
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Red 14GA - Constant Power Positive (Fused 10 amp.)
Brown 14GA - Constant Negative to all Components
Pink 16GA - 12V Positive Reference Signal to Control Module
Orange 14GA - 12V Switched Positive to Coolant Pump
Purple 16GA - 12V Switched Positive to Pressure Sensor (X6),
Ambient Thermostat (X7) and System Control Relay (X10)
Not Used
Black 20GA - Storage Core Digital Temperature Sensor
White 20GA - Storage Core Digital Temperature Sensor
Viewed from wire insertion side
LEGEND
X1
OFF
ON
ACC
Key Switch
Position
