Webasto BCT010300C Repair Manual Page 20

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Troubleshooting – BlueCool Truck Electrical System
Webasto Product N.A., Inc. 18 www.techwebasto.com
Checking for a 12 volt switched output signal at control module (vehicle key ON or engine running)
Figure 18. 12 volt switched output signal at control module - charging mode
Checking 12 volt input signal from control module to system control relay
Figure 19. 12 Volt input signal from control module to system control relay (through pressure sensor and ambient
thermostat)
1
2
34
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
VDC
V
V
Volts DC
_
+
OFF
ON
ACC
Key Switch
Position
> 30 min.
V DC
V
V
Volts DC
_
+
ON
POWER
OFF
X10
X11
Blue 12GA - 12V Switched Output to Condensor Fan (X9)
Brown 14GA - Ground to Battery Negative Post
Purple 16GA - 12V Input from Control Module (X1),
Pressure Sensor (X6) and Ambient Thermostat (X7)
Red 12GA - Constant Power Positive (Fused 20 amp.)
Not Used
Viewed from wire insertion side
LEGEND
87a
87
30
85
86
30
85
86
87
87a
To Inverter
ON/OFF Circuit
X10
OFF
ON
ACC
Key Switch
Position
> 30 min.
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