BMW 1992 525i Electrical Troubleshooting Manual page 415

(
l!iwiiNTEGRATED CLIMATE REGULATION WITH FILTER (IHKR/F3)
..... .....
~
Pin
TYpe
Description/Function Connection TYpe of Signal Tester Display Measurement Notes
24
A Function light, rear window defogger Switching unit approx. 7.5 V LED ON (light OFF)
approx. 8.5 V LED OFF (light OFF)
25
A Function light, air recirculation Switching unit approx. 7.5 V
LED ON (light OFF)
approx. 8.5 V LED OFF (light OFF)
26
A Function light, air recirculation
Switching unit approx. 7.5 V LED ON (light OFF)
control approx. 8.5 V LED OFF (light OFF)
X18156
Pin
TYpe
Description/Function Connection TYpe of Signal Tester Display Measurement Notes
1 E Ground tor electronics Ground
ov
2 Not used
Q)
J:ll,
3 E Interior temperature sensor Control switch approx. 1. 7 V to 10° C to 40° C approx. 5 V with
(J1
0
.
3.4V temperature sensor (J1
I
disconnected (')
4 E
Nominal air flow value
Control switch approx. 0.6 V-4 V OFF (approx. 100%)
5
E
Nominal temperature value, left Control switch approx. 0.5 V to
16° C to 32° C
4.2V
6
E
Nominal temperature value, right Control switch approx. 0.5 V to
16° Cto32° C
4.2V
7
Not used
8 Not used
9 A
Auxiliary fan signal DME control unit
approx. OV ON
approx. 12 V OFF
10 E
Ground for electronics Ground
ov
11 Not used
12 E
Plus voltage supply for control unit Connector terminal30
approx. 12 V
...
f8
!\)