Installation manual

www.webasto.us 31 Webasto Thermo & Comfort N.A., Inc.
Thermo Pro 90 Circuit Diagrams
12.1 Thermo Pro 90 Circuit Diagram Legend
Item Designation Comment
A1
Heater
A2
Control module
B1
Exhaust Temperature sensor
B2
Coolant temperature sensor
B3
Temperature limiter/ overheat sensor
BT
Battery Vehicle battery
H1
Operation indicator light
1
Vehicle blower circuit Terminal needs to be added to X14
Webasto P/N: 901204 Deutsch P/N:0462-209-16141
E
Glow plug
F1
Fuse 5 A ATM mini flat fuse
F2
Fuse 20 A ATM mini flat fuse
F3
Fuse 30 A ATO flat fuse
H1
“Heating” symbol in the display Operating indicator (in item P2)
H3
Symbol light Light (in item P2)
M1
Motor Combustion air fan
M2
Motor Circulating pump
P1
SmarTemp fx For programmed operation
P2
Digital timer 1531 For programmed operation
S1
Toggle switch ON/OFF
X1
4-pin plug connector To item M1 (Combustion air fan motor)
X2
Plug connector, 2-pin To item E (igniter)
X3
Plug connector, 2-pin To connector X11 (Fuel pump)
X4
Plug connector, 2-pin To connector X12 (Circulating pump)
X5
Plug connector, 2-pin To item B2 (Coolant temperature sensor)
X6
Plug connector, 2-pin To item B1 (Exhaust temperature sensor)
X7
Plug connector, 2-pin To item B3 (Temperature limiter)
X8
12-pin plug connection To item A1 (Control unit)
X10
Plug connector, 2-pin Diagnostics
X11
Plug connector, 2-pin To item Y1 (Fuel pump)
X12
Plug connector, 2-pin To item M2 (Circulating pump)
X13
Plug connector, 9-pin To item X14
X14
Plug connector, 9-pin To item S1 or P1
X15
Plug connector, 4-pin To item X16
X16
Plug connector, 4-pin To item P1
Y1
Metering pump Fuel pump for heater