Checking multi-function switch F125 with 8-pin connector — AUDI

Checking
multi-function switch
F125
with 8-pin connector
Note
Read measured value block 004 for multi-function switch before performing electrical check.
Make sure that selector lever cable is properly adjusted
Automatic gearbox 01V, front-wheel drive and four-wheel drive
Rep. Gr.
37
.
On vehicles fitted with auxiliary heater, remove screws
arrows
securing exhaust pipe of auxiliary/ additional heater to noise insulation.
Release fasteners
1
and detach noise insulation.
Unplug connector
2
of multi-function switch
F125
at front left of gearbox.
Contact assignment at 8-pin connector of
multi-function switch
F125
.
Test step No. 1
Contacts on
F125
Items tested
Test conditions and additional steps
Specification
Fault rectification if readout does not match specification
1 + 2
Multi-function switch
F125
Ignition switched off
Switched to resistance measuring range
Selector lever in
“P”
,
“N”
,
“D”
Less than 1 Ω
Check connector at multi-function switch for contact corrosion, moisture or loose fitting
Check selector lever cable adjustment
Automatic gearbox 01V, front-wheel drive and four-wheel drive
Rep. Gr.
37
Renew multi-function switch
Automatic gearbox 01V, front-wheel drive and four-wheel drive
Rep. Gr.
37
Selector lever in
“R”
,
“4”
,
“3”
,
“2”
∞ Ω
1 + 3
Selector lever in
“R”
,
“N”
,
“4”
Less than 1 Ω
Selector lever in
“P”
,
“D”
,
“3”
,
“2”
∞ Ω
1 + 4
Selector lever in
“N”
,
“D”
,
“4”
,
“2”
Less than 1 Ω
Selector lever in
“P”
,
“R”
,
“3”
∞ Ω
1 + 5
Selector lever in
“D”
,
“4”
,
“3”
Less than 1 Ω
Selector lever in
“P”
,
“R”
,
“N”
,
“2”
∞ Ω
Test step No. 2
Contacts on
F125
Items tested
Test conditions and additional steps
Specification
Fault rectification if readout does not match specification
6 + 7
P/N signal from
multi-function switch
F125
Ignition switched off
Switched to resistance measuring range
Selector lever in
“R”
,
“D”
,
“4”
,
“3”
,
“2”
∞ Ω
Check connector at multi-function switch for contact corrosion, moisture or loose fitting
Check selector lever cable adjustment
Automatic gearbox 01V, front-wheel drive and four-wheel drive
Rep. Gr.
37
Renew multi-function switch
Automatic gearbox 01V, front-wheel drive and four-wheel drive
Rep. Gr.
37
Selector lever in
“P”
,
“N”
Less than 1 Ω
Test step No. 3
Contacts on
F125
Items tested
Test conditions and additional steps
Specification
Fault rectification if readout does not match specification
1 + 8
Reversing light signal from
multi-function switch
F125
Ignition switched off
Switched to resistance measuring range
Selector lever in
“P”
,
“N”
,
“D”
,
“4”
,
“3”
,
“2”
∞ Ω
Check connector at multi-function switch for contact corrosion, moisture or loose fitting
Check selector lever cable adjustment
Automatic gearbox 01V, front-wheel drive and four-wheel drive
Rep. Gr.
37
Renew multi-function switch
Automatic gearbox 01V, front-wheel drive and four-wheel drive
Rep. Gr.
37
Selector lever in
“R”
Less than 1 Ω
Checking voltage supply of multi-function switch
Connect multimeter for voltage measurement between contacts
1
and
6
of the 8-pin connector.
Switch on ignition.
Specification: approx. battery voltage.
If readout does not match specification:
Repair wiring
Current flow diagrams, Electrical fault finding and Fitting locations
.
Checking wiring between 8-pin connector for multi-function switch and gearbox control unit
Connect
adapter
V.A.G 1598/20
(test box) to
automatic gearbox control unit
J217
Chapter
.
Connect multimeter for resistance measurement between contacts on the 8-pin connector and the sockets on
adapter
V.A.G 1598/20
(test box), as shown in the following table.
Connector
Contact
Adapter
1598/20
(test box)
Socket
Specification
1
54 and 55
Less than 1.5 Ω
2
36
Less than 1.5 Ω
3
8
Less than 1.5 Ω
4
37
Less than 1.5 Ω
5
9
Less than 1.5 Ω
6
6, 34 and 28 if necessary
Less than 1.5 Ω
7
Anchor
, Test step No. 2
8
Anchor
, Test step No. 3
Note
If readout does not match specification, rectify open circuit in wiring according to current flow diagram and check connector for contact corrosion, moisture and leaks.
If readout obtained in this wiring check matches specification, the
multi-function switch
F125
must be renewed
Automatic gearbox 01V, front-wheel drive and four-wheel drive
Rep. Gr.
37
.