Fault code 45
1. Pull off plug II at the alarm control module.
2. Disconnect plug connection X 11 (driver's side).
3. Disconnect the plug connection X 12 (passenger's side).
4. Switch on ignition.
5. Connect voltmeter to plug II pin 9 and ground.
Display: 0 Volt
6. Connect voltmeter to plug II pin 3 and ground.
Display: 0 Volt
7. Switch off ignition.
8. Ohmmeter at plug connection X 11 pin 19 and pin 20 (sleeve side).
Display: 5 - 7 Ohms at 20 锟斤拷C
9. Ohmmeter at plug connection X 12 pin 19 and pin 20 (sleeve side).
Display: 5 - 7 Ohms at 20 锟斤拷C
Test Point 1
Test point 1
Control module faulty
DTC 4607
If "Control module faulty" is displayed in combination with DTC 4226, 4231, 4236, 4241, 4246, 4251, 4256, or 4261, test point 10 is relevant.
If the control module is damaged, the complete hydraulic unit with integrated control module must be replaced.
IMPORTANT:
- Before replacing the hydraulic unit, check whether:
- there are voltage differences due to contact resistance (missing or poor ground connections).
- Poor ground connections can be present not only on the affected parts, but also at other important ground points.
- ground is connected to control module connector PIN 16 (from ground point 2) and PIN 19 (from electronics ground). The locations of the
ground points are shown on the wiring diagram Ground points.
- positive voltage (vehicle voltage) is connected to control module connector PIN 17 and PIN 18.
Test Point 2
Test point 2
Front left speed sensor, signal implausible
DTC 4206
Control module receives a false / unrealistic speed sensor signal.
Procedure
Check the speed sensor signal with the System Tester 2 via the "Actual values" menu. To do this, call up the front left wheel speed.
Two tests are possible here.
Test 1 with raised vehicle.
(Swap of speed sensors and test of the speed sensor signal quality).
Test 2 with vehicle driving straight at approx. 2-4 km/h.
(Comparison of wheel speed signal qualities with each other).
Test 2 is a better measure of the signal quality than is test 1.