Notes for test table

The socket designations of the VAG1598 test box are identical to the terminal designations of the ABS control module (w/EDL) -J104- in the wiring diagram.
If the measured values do not match the specifications, carry out the corrective actions on the right side of the table.
Use the VAG1594 connector kit for continuity tests (bridging).
If measured values differ only slightly from specified values, clean sockets and connectors of the testers and test leads (using G 000 700 04 contact spray) and repeat test. Before replacing the relevant components, check wires and connections and also repeat resistance measurement at component, especially for specified values under 10 Ω.

TEST STEP 1

Set measurement range:
voltage test (20 V =)

Test step

VAG 1598 sockets

Test of

Test requirements

Additional work steps

Specified value

Corrective action

19 + 15

Voltage supply to control module via terminal 15

Ignition switched on.

10.0 to 14.5 V

Check wire from terminal 19 to Ground (GND).
Check wire from terminal 15 to terminal 15.

TEST STEP 2

Set measurement range:
voltage test (20 V =)

Test step

VAG 1598 sockets

Test of

Test requirements

Additional work steps

Specified value

Corrective action

16 + 17

Voltage supply of ABS hydraulic unit -N55- and motor for ABS return flow pump -V39- via terminal 30, B+

Ignition switched on.

10.0 to 14.5 V

Check wire from terminal 16 to Ground (GND).

16 + 18

10.0 to 14.5 V

Check wiring from terminals 17 and 18 to B+ (terminal 30) via fuse (60A).

TEST STEP 3

Set measurement range:
voltage test (20 V =)

Test step

VAG 1598 sockets

Test of

Test requirements

Additional work steps

Specified value

Corrective action

19 + 14

Function of brake light switch -F-

Ignition switched off
Brake pedal not depressed

Operate brake pedal.

0.0 to 0.5 V
10.0 to 14.5 V

Check wire from terminal 19 to Ground (GND).
Check wiring from terminal 14 to terminal 30 via fuse (10A).
Check brake light switch -F-
Adjust brake light switch -F-, see BRAKE LIGHT SWITCH -F-, ADJUSTING

TEST STEPS 4 & 5

Set measurement range: Resistance measurement (2 k Ω)
Test step	VAG 1598 sockets	Test of	Test requirements Additional work steps	Specified value	Corrective action
4	4 + 5	Resistance of right front ABS wheel speed sensor -G45- (Vehicles with ABS, ABS/EDL and all wheel drive with EDL)	Ignition switched off	0.4 to 2.3k Ω	Check electrical wiring between control module and wheel speed sensor for open circuit and for short circuit to Ground (GND) or B+
4	3 + 5	Resistance of right front ABS wheel speed sensor -G45- (Vehicles with EDL/ASR)			Check harness connectors. Move wire during test (loose contact).
5	6 + 7 (all versions)	Resistance of left front ABS wheel speed sensor - G47-			Replace the relevant ABS wheel speed sensor if specified value is not obtained and the electrical wiring is OK.

TEST STEPS 6 & 7

Set measurement range: Resistance measurement (2 k Ω)
Test step	VAG 1598 sockets	Test of	Test requirements Additional work steps	Specified value	Corrective action
6	1 + 3	Resistance of right rear ABS wheel speed sensor -G44- (Vehicles with ABS, ABS/EDL)	Ignition switched off	0.4 to 2.3k Ω	Check electrical wiring between control module and wheel speed sensor for open circuits and for short circuit to Ground (GND) or B+
6	1 + 2	Resistance of right rear ABS wheel speed sensor -G44- (Vehicles with EDL/ASR and all wheel drive with EDL)			Check harness connectors. Move wire during test (loose contact).
7	8 + 9 (all versions)	Resistance of left rear ABS wheel speed sensor - G46-			Replace the relevant ABS wheel speed sensor if specified value is not obtained and the electrical wiring is OK.

TEST STEPS 8 & 9

Set measurement range:
Voltage measurement (20 V =) in test step 8, resistance measurement (200 Ω) in test step 9

Test step

VAG 1598/24 connector

Test of

Test requirements

Additional work steps

Specified value

Corrective action

Voltage supply for VAG1551, harness connector T16

Connect VAG1526 multimeter to T16⁽¹⁾ using VAG1594 connector test kit

Check wire from T16/4 to Ground (GND).
Check wire from T16/16 to terminal 30 via S12.

Terminal 4 - Ground (GND)
Terminal 16 - B+

10.0 to 14.5 V

Resistance of the K-wire for On Board Diagnostic (OBD), harness connector T16

Ignition switched off

Using the VAG1594 connector test kit, connect socket 11 of the VAG1598 test box and terminal 7 of the T16 harness connector to the VAG1526 multimeter.

max: 1.5 Ω

Check wire from terminal T16/7 to terminal 11.

⁽¹⁾	See MULTI-PIN HARNESS CONNECTOR WITH TERMINAL ASSIGNMENTS , Terminal assignment of diagnostic connector

TEST STEP 10 (1 OF 3)

Function test: ABS warning light -K47-
Test step	VAG 1598 sockets	Test of	Test requirements Additional work steps	Specified value	Corrective action
10	-	Function of ABS warning light -K47-.	DTC memory checked and no DTC present in DTC memory of ABS control module -J104-. Ignition switched off Multi-pin connector connected to ABS control module -J104- and retainer catch engaged.
Test step 10: Continued in next table.

TEST STEP 10 (2 OF 3)

Function test: ABS warning light -K47-
Test step	VAG 1598 sockets	Test of	Test requirements Additional work steps	Specified value	Corrective action
10 Continuation:	-	Function of ABS warning light -K47-.	Switch on ignition	ABS warning light -K47- lights up for two (2) seconds and then goes out.	If ABS warning lamp does not light up: Check vehicle voltage and wire from terminal 21 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. After 3 seconds, the warning light for brake system -K118- will light up. Check wire from terminal 21 of ABS control module - J104- to instrument cluster for short circuit to B+ and open circuit.
Test step 10: Continued in next table.

TEST STEP 10 (3 OF 3)

Function test: ABS warning light -K47-

Test step

VAG 1598 sockets

Test of

Test requirements

Additional work steps

Specified value

Corrective action

10
Continuation:

Function of ABS warning light -K47-.

Switch on ignition

ABS warning light -K47- lights up for two (2) seconds and then goes out.

If the vehicle voltage and the wiring from terminal 21 of ABS control module -J104- to the instrument cluster are OK: The LED lights or warning lamps are faulty.

Malfunction in instrument cluster
See Instrument cluster .

TEST STEP 11

Function test: Warning light for brake system -K118-

Test step

VAG 1598 sockets

Test of

Test requirements

Additional work steps

Specified value

Corrective action

Function of warning light for brake system - K118-

Brake fluid level is OK.
Ignition switched off
Multi-pin connector connected to ABS control module - J104- and retainer catch engaged.

Switch on ignition.

Warning light for brake system - K118- lights up for two -2- seconds and then goes out again.

Check warning contact for brake fluid.

Check wire from terminal T32a/29 (instrument cluster) to warning contact for brake fluid for short circuit to Ground (GND).
Malfunction in instrument cluster.

TEST STEP 12 (1 OF 2)

Function test: Traction control indicator light -K86- (only installed in vehicles with ASR).
Test step	VAG 1598 sockets	Test of	Test requirements Additional work steps	Specified value	Corrective action
12	-	Function of traction control indicator light - K86-	DTC memory checked and no DTC present in DTC memory of ABS control module -J104-. Ignition switched off Multi-pin connector connected to ABS control module -J104- and retainer catch engaged.
Test step 12: Continued in next table.

TEST STEP 12 (2 OF 2)

Function test: Traction control indicator light -K86- (only installed in vehicles with ASR).

Test step

VAG 1598 sockets

Test of

Test requirements

Additional work steps

Specified value

Corrective action

12
Continuation:

Function of traction control indicator light -K86-

Switch on ignition

Traction control indicator light - K86- comes on for two (2) seconds and then goes out.

If traction control (ASR) indicator lamp does not light up:
- Check vehicle voltage and wire from terminal 20 of ABS control module - J104- to instrument cluster for open circuit and short circuit to B+.
If traction control (ASR) indicator lamp remains constantly lit:
- Check wire from terminal 20 of ABS control module - J104- to instrument cluster for short circuit to Ground (GND).
=>Electrical Wiring Diagrams, Troubleshooting & Component Locations
If the vehicle voltage and the wiring from terminal 20 of ABS control module -J104- to the instrument cluster are OK: The LED lights or warning lamps are faulty.
See appropriate Instrument cluster .

TEST STEP 13 (1 OF 2)

Function test: Traction control (ASR) button (Only for vehicles with ASR)
Test step	VAG 1598 sockets	Test of	Test requirements Additional work steps	Specified value	Corrective action
13	-	Function of traction control button	Switch ignition off. Function of traction control indicator light - K86- was already checked in step 8. Multi-pin connector connected to ABS control module -J104- and retainer catch engaged. Switch on ignition
			Press traction control button	Traction control indicator light - K86- lights up	Switch off ignition. Detach multi-pin connector from ABS control module -J104- and remove.
			Press traction control button again	Traction control indicator light - K86- goes out.	Connect VAG1598 test box using VAG1598/27 adapter.
Test step 13: Continued in next table.

TEST STEP 13 (2 OF 2)

Function test: Traction control (ASR) button (Only for vehicles with ASR)
Test step	VAG 1598 sockets	Test of	Test requirements Additional work steps	Specified value	Corrective action
13	19 + 31	Function of traction control button	Ignition switched on.
Continuation:			Traction control button not pressed	0.0 to 0.5 V
Continuation:			Traction control button pressed	10.0 to 14.5 V	Check wire from terminal 19 to Ground (GND). Check wire from terminal 31 to traction control button, terminal 6. Check voltage supply from terminal 5 of traction control button to terminal 15. If no malfunctions can be found using the procedures in these steps, replace the traction control button.

TEST STEP 14

Set measurement range: Resistance measurement (200 Ω/20 M Ω)
Test step	VAG 1598 sockets	Test of	Test requirements Additional work steps	Specified value	Corrective action
14	29 or 30	Databus wires	Ignition switched off Set measuring range to 200 Ω Disconnect multi-pin connectors from the control modules that are connected vie a databus wire.
14	29 or 30	Databus wires	Check databus wires for open circuit.	max: 1.5 Ω	Check wire routing according to wiring diagram
			Set measuring range to 20 MΩ Check wires for short circuit to B+ or Ground (GND).	INFINITY Ω	Repair wire connections according to wiring diagram. See