brake light AUDI A4 1999 B5 / 1.G Brakes Read Mesure Value Block Workshop Manual

01-65
Test table: display group 2 Read measuring value block
2
Indicated on display
0 or 1
0 or 1

0 or 1
0 or 1



ABS solenoid valve relay:
For vehicles with Front Wheel Drive (FWD), the display shifts one field toward
left.
0 not permitted during "Read measuring value block", the relay was not
activated during "ignition on".
- Carry out "Electrical test", step 11 page 01
-68
.
1 specified value, relay was activated by ABS control module -J104- during
ignition on.

Voltage at motor for ABS return flow pump:
For vehicles with Front Wheel Drive (FWD), the display shifts one field toward left.

0 specified value, there is no voltage at the motor for the ABS return flow pump. 1 not permitted during "Read measuring value block", there is voltage at the motor for the
ABS return flow pump.
- Carry out "Electrical test", step 12 page 01
-68
.

Brake light switch: Additional signal only for
All Wheel Drive (AWD):
Pa
ge 6 of 79 Read Measurin
g Value Block
(function 08
)
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0 Brake pedal not operated1 Brake pedal operated

Electrical Wiring Diagrams, Troubleshooting & Component
Locations - Check brake light switch if there are deviations.
Brake light switch: Signal for Front
and All Wheel Drive:

0 Brake pedal not operated 1 Brake pedal operated


Electrical Wiring Diagrams, Troubleshooting & Component Locations - Check brake light switch if there are deviations.
Pa
ge 7 of 79 Read Measurin
g Value Block
(function 08
)
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01-74

Terminal
Wire connection to component ...
37
Hydraulic unit; activation of ABS solenoid valve relay -J106- 38
Right rear ABS wheel speed sensor -G44- 42
Right front ABS wheel speed sensor -G45-
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR for vehicles with All Wheel Drive (AWD) and ABS/EDL (throttle valve regulation)
44
Traction control (ASR) button
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
45
TI (Transmission Influence)
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
46
K-wire 47
Engine Control Module (ECM); AET (Actual Engine Torque)
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
47
Brake light switch -F-
for vehicles with All Wheel Drive (AWD) and ABS/EDL
48
Brake light switch -F- 50
Battery + (terminal 30) 53
Hydraulic unit; left rear ABS inlet valve -N134-
Pa
ge 19 of 79 Read Measurin
g Value Block
(function 08
)
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01-89

Function test: ABS warning light -K47-
Test step
VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified value
Corrective action
19

Continuation: - Function of
ABS
warning
light -K47- - Switch on
ignition ABS warning
light -K47- lights
up for two (2)
seconds and
then goes out.
Electrical Wiring Diagrams,
Troubleshooting & Component Locations - If ABS warning light does not come on,
check voltage of electrical system and test
wiring from terminal 32 of ABS control
module -J104- to instrument cluster for
short circuit to Ground (GND).
- The ABS warning lamp does not switch
off after 2 seconds. The red "brake system
malfunction" symbol lights up after 2
seconds. Check wire from terminal 32 of
ABS control module -J104- to instrument
cluster for short circuit to B+ and open
circuit.

Repair Manual, Electrical Equipment,
Repair Group 90; Instrument cluster
- Are both the vehicle voltage and the
wiring from terminal 32 of ABS control
module -J104- to the instrument cluster
OK? Malfunction in instrument cluster. Pa
ge 44 of 79 Read Measurin
g Value Block
(function 08
)
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yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-90

Function test: Red brake warning symbol
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective
action
20 - Function of red "brake
system malfunction"
symbol
Repair Manual, Brake System, Repair
Group 47

Brake fluid level is OK Function of ABS warning light -K47-
already checked in step 19. Multi-pin connector connected to ABS
control module -J104- and retainer
catch engaged. Switch on ignition
Test step 20: Continued on
next page.
Pa
ge 45 of 79 Read Measurin
g Value Block
(function 08
)
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e=re
pair&id=AUDI.B5.SU02.01.8

01-91

Function test: Red brake warning symbol
Test step
VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified value
Corrective action
20

Continuation: Function of red
"brake system
malfunction"
symbol - For vehicles with
automatic transmission and
high-line instrument cluster,
depress the brake pedal
and select a driving gear. The ABS/EDL indicator
lamp and the red "brake
system malfunction"
symbol light up. If the
traction control indicator
light is installed and OK, it
also lights up. Repair Manual,
Electrical Equipment, Repair Group 90; Instrument cluster
- Malfunction in
instrument cluster
Pa
ge 46 of 79 Read Measurin
g Value Block
(function 08
)
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01-109

Output on printer of
VAG1551 Scan Tool
(ST) Possible cause
Corrective action
DTC
00526
Brake light switch -F-
FWD:
Open circuit
Both brake lights -M9- (left) and -M10- (right)
malfunctioning or ABS control module -J104-
malfunctioning.
Wire from brake lights to control module faulty. Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - Locate and repair open circuit or
short circuit.
- Replace bulbs.
- Check brake light switch, "Read
measuring value block", display
group 2 page 01
-65
.
AWD:
Implausible signal
Open circuit or short circuit to B+ or Ground (GND) in
wiring between brake light switch and the bulbs for brake
lights -M9- (left), -M10- (right) or ABS control module -
J104-.
Bulb for left brake light -M9- or right brake light -M10-
malfunctioning.
Brake light switch malfunctioning.
Pa
ge 68 of 79 Read Measurin
g Value Block
(function 08
)
11/20/2002 htt
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yp
e=re
pair&id=AUDI.B5.SU02.01.8