ad8370s600202a

Heater booster test of electrical system heater unit switch on signal

Type ad · emne 83.70 · version 0101 · 2003-06-16

Gælder for: MODEL 638 with ENGINE 611.980 with CODE (MQ3) Motor OM611 DE22 A (60 KW) with CODE (MQ4) Motor OM611 DE22 LA (75 KW) with CODE (MQ5) Motor OM611 DE22 LA (90 KW) MODEL 638 with ENGINE 611.980 with CODE (HZ5) Warmwasser-Zusatzheizung 10KW mit Zeitschaltuhr

Ikke tilgængelig på “da”; vises på Engelsk.

Placering

Funktionsgruppe 3 Karrosseri › 83 Klimatisering › 83.70 Parkeringsvarmesystem, ekstra varmesystem, ekstra varmeapparat — Serie 611 (modeller 980) · Serie 638

EinPAS 39 Varmesystem/ventilation/køling › 39.25 Parkeringsvarme/ekstra varmesystem › 39.25.1 Grundinformation — Serie 611 (modeller 980) · Serie 638

AD83.70-S-6002-02A

Heater booster test of electrical system heater unit switch on signal

Scope of test

Measuring instrument/

Test connection

Operation/Requirement

Specified value

Possible cause/Remedy

1.0

Cable

Open-circuit

A20.2

10

A90.1

7

Ignition: OFF

A90.1 disconnected

A20.2 disconnected

< 5Ω

Open-circuit

Connection to J108 (code HZ5 only)

1.1

1.1

Short-circuit to ground

A90.1

7

Ignition: OFF

A90.1 disconnected

A20.2 disconnected

> 20kΩ

Short-circuit to ground

1.2

1.2

Short-circuit to positive

A90.1

7

Ignition: OFF

A90.1 disconnected

A20.2 disconnected

Ignition: ON

< 1 V

Short-circuit to positive

1.3

1.3

Switch-on signal from climate control pushbutton control unit (A20)

Signal

A20.2

10

Remove Bowden cable from climate control pushbutton control unit

Without disconnecting, measure on the rear side of the connector A20.2

Press heater booster switch (A20s6)

Press heater booster switch (A20s6) again

11 - 14 V

approx. 1 V

Climate control pushbutton control unit (A20)

Value in order

Heater booster A90