Cruise Control System Switch, Testing

Cruise Control System Switch, Testing

Special tools, testers and auxiliary items required

• Multimeter (V.A.G 1526 A)

• Connector test kit (V.A.G 1594 A)

• Test box (VAG1598/31)

• Vehicle diagnostic, testing and information system ( VAS 5051)

• Adapter (VAS 5051/1)

The cruise control system (CCS) has no components of its own (except for the operating switch (E45)). All cruise control functions are carried out by the Engine Control Module (ECM).

Work sequence

CAUTION!
To avoid danger of accident when performing measurement and test drives, observe safety precautions => [ Safety Precautions ] Multiport Fuel Injection.

- Connect (VAS 5051) and select vehicle system " 01 -Engine electronics" in selection. Refer to => [ VAS5051, Connecting and Selecting Functions ] VAS 5051, Connecting and Selecting Functions

When doing this the ignition must be switched on.

Display on (VAS 5051):





- Under - 1 - select diagnostic function "08 - Read measured value block".

Display on (VAS 5051):





1. Enter display group

- Enter "066" for "display group number 066" in field - 2 - and confirm entry by pressing Q button.

Display on (VAS 5051):





- Check indication in display field - 2 -.

- Road test vehicle to check switch positions as shown in display field - 4 -.





- Exit function "08 - Read measured value block" by pressing arrow button.

If "0" appears in display field 2 even with activated CCS:

- Connect test box (VAG1598/31) to wiring harness for ECM and also directly to ECM. Refer to => [ Electrical Testing, with Test Box VAG 1598/31 ] Electrical Testing, With Test Box VAG 1598/31.

- Connect multimeter as follows to measure voltage:





- Switch ignition on.

• Specification for CCS switched off: 0 V

• Specification for CCS switched on: approx. battery voltage (B+)

If the specified value is not obtained:

- Check for open circuit and short to positive (B+) or ground (GND) in following wiring connections:





- Repair any open/short circuit as needed..

Significance of 8-digit display in display field 4





If specifications in display field 4 are not obtained:

- Check CCS switch (E45).