Webasto BCT010300C Repair Manual download pdf (Page 25)

Troubleshooting – BlueCool Truck Electrical System

www.webasto.us 23 Webasto Product N.A., Inc.

™

5.3 Malfunctions with System in Discharge Mode and Vehicle Key OFF (Sleeper Cooling)

The following table lists the possible malfunctions.

With the vehicle key in the OFF position, check operation of the air-handler by turning both knobs of the control panel

on. A small green LED should illuminate. If the green LED does not illuminate and there is no air circulation through

the air-handler, check fuses and battery connections. Repair as necessary. If this does not remedy the malfunction,

follow the troubleshooting procedures listed in Table 8. If the LED does illuminate but air circulating fans and/or water

pump do not function, follow the troubleshooting procedures listed in Table 8.

Checking air circulation fan circuits

Figure 28. Air circulation fan circuit checks (variable output DC voltage)

Table 8. Malfunction of components during discharge mode (sleeper cooling) with key OFF

Symptom/Malfunction Inspection Remedy

12 volts negative and/or

positive not present at control

module.

Check 10 amp. fuse at fuse holder X2.

Check for

power on pin-1 (red wire) and ground on pin-2

(brown wire) of control module connector X1.

Refer to Fig. 16,

on pg. 17.

Replace blown/defective fuse.

Damaged or open circuit. Repair wiring or

connections.

No ground connection. Repair wiring or

connections.

No output to circulation fans

at control module.

With fan control turned on, check for output voltage at the 4

2-pin connectors of the control module. Refer to Fig. 28, on

pg. 23.

Replace control module.

One or more circulation fans

not operating.

With fan control turned on, check for power at the 2-pin

connectors on the control module of the suspect fan. Refer to

Fig. 28, on pg. 23.

Power present at 2-pin connector? Replace fan.

Power not present at 2-pin connector? Replace

control module.

Coolant circulation pump not

operating. Control module

malfunction suspected.

With fan control on and cooling control on full, check for

power at pin-4 (orange wire) and ground at pin-2 (brown

wire) at control module connector X1. Refer to Fig. 29, on pg.

24.

Power present at pin-4? Check circulation pump

and wiring.

Power not present at pin-4? Ensure there is a

ground circuit at pin-2. If present, replace control

module.

Coolant circulation pump not

operating. Circulation pump

malfunction suspected.

With fan control on and cooling control on full, check for

power at circulation pump connector X8 (orange wire) and

ground at (brown wire). Refer to Fig. 30, on pg. 25.

Power and ground present? Replace circulation

pump.

Power or ground not present? Open circuit. Repair

or replace harness.

V DC

Volts DC

OFF

ACC

Key Switch

Position

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 53 54

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Webasto BCT010300C Repair Manual Page 25

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