Webasto BCT010300A Service And Repair Manual - page 17
Troubleshooting – BlueCool Truck Electrical System
www.webasto.us
15
Webasto Product N.A., Inc.
™
Special instructions:
1. If no refrigerant pressure is detected, fill system with 0.25 lb. of refrigerant to enable leak detection with electronic
leak detector.
2. For refrigerant leaks found in the area of the Thermal Expansion Valve located on the storage core unit, contact
Webasto Product North America at 1-800-432-8371 for further information concerning the repair or replacement
of the storage core assembly.
Table 5. Symptom:
System does not begin operation after 1/2 hour delay period expires and anytime thereafter. Condenser
fan, power inverter and refrigerant compressor DO NOT respond.
Symptom/Malfunction
Inspection
Remedy
IMPORTANT! Storage core temperature must be above 30 °F (–1 °C) and ambient temperature above 60 °F (15.5 °C).
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.
“Key On Signal” from
vehicle key on power source
not present
Check connection of pink wire to vehicle key on power
source.
Check for power on pin-3 (pink wire) and ground on pin-2
(brown wire) of control module connector X1. Refer to Fig. 17,
on pg. 17.
Repair as necessary.
Damaged or open circuit. Repair wiring or
connections.
12 volts positive not present at
control module output to
system control relay.
Check for power on pin-5 (purple wire) and ground on pin-2
(brown wire) of connector X1. Refer to Fig. 18, on pg. 18.
If no output on pin-5 after more than 30 minutes,
replace control module.
System control relay not
responding.
Check 20 amp. fuse at fuse holder X4.
Check for power on pin-87 (red wire) and ground on pin-85
(brown wire). Refer to Fig. 20, on pg. 19.
Check for power on pin-86 (purple wire) and ground on pin-
85 (brown wire). Refer to Fig. 19, on pg. 18.
Check for power output on pin-30 (blue wires) of relay socket
X10. Refer to Fig. 21, on pg. 19.
Replace Blown or defective fuse.
Damaged or open circuit. Repair wiring or
connections.
Inspect ambient temperature and or high/low
pressure switches for continuity.
Damaged or open circuit. Repair wiring or
connections.
If no output on pin-30, replace relay.
Ambient temperature sensor -
open circuit.
Check for continuity across terminals of ambient temperature
sensor. Sensor will be open at temperatures less than 45 °F
(7.2 °C) and closed above 60 °F (15.5 °C). Refer to Fig. 24, on
pg. 21.
Replace if damaged or defective.
Cold storage unit digital
temperature sensor - open
circuit or defective
Inspect sensor wiring for corrosion, damage or open circuit.
Test sensor using Sensor Reader Tool P/N BCT010249A
A reading of “T: ERROR”, indicates there is a fault
with the digital temperature sensor or damage to
the connector or wiring. Repair or replace as
necessary.
High/Low refrigerant pressure
switch - open circuit.
Check for continuity across terminals of the pressure switch.
Switch will be open at pressures less than 29 psi (2.0 bar) or
above 326 psi (22.5 bar). Refer to Fig. 25, on pg. 21.
Low refrigerant pressures with discharged cold storage core.
Replace if damaged or defective.
See “Low pressure or no refrigerant.”
Low pressure or no
refrigerant.
Using an electronic leak detector, check for refrigerant leaks at
refrigerant connections, fittings and pressure sensor within the
charge unit. See “Special Instructions” item 1”.
Check cold storage core unit in the area of the TXV for leaks.
Repair leaks and service refrigeration system.
See Special Instructions” item 2.