Captiva

DTC C0035-C0050

The wheel speed sensor receives ignition voltage from the electronic brake control module (EBCM) and provides an output signal to the EBCM. As the wheel spins, the wheel speed sensor sends a DC square wave signal. The EBCM uses the frequency of the square wave signal to calculate the wheel speed.

C0035-C0050 00

Ignition ON.

C0035-C0050 0F

C0035-C0050 18

C0035-C0050 00

A short to voltage, short to ground or an open/high resistance is detected on a wheel speed sensor circuit.

C0035-C0050 0F

The EBCM detects a rapid variation in the wheel speed. The wheel speed changes by 20 km/h (12 mph) or more in 0.01 second. The change must occur 3 times with no more than 0.2 second between occurrences.

C0035-C0050 18

OR

If 2 or more wheel speed sensors are inoperative diagnose each wheel speed sensor individually.

If the customer comments that the ABS indicator is ON only during moist environmental conditions: rain, snow, vehicle wash, etc., inspect the wheel speed sensor wiring for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion by using the following procedure:

1. Spray the suspected area with a 5 percent saltwater solution. To create a 5 percent saltwater solution, add 2 teaspoons of salt to 8 fl oz of water (10 g of salt to 200 ml of water).
2. Test drive the vehicle over various road surfaces, bumps, turns, etc., above 40 km/h (25 mph) for at least 30 seconds. Also rotate steering wheel from stop to stop for intermittent condition caused from open or chaffing of the front wheel speed sensor harness.
3. If the DTC returns, replace the suspected wheel speed sensor or repair the wheel speed sensor wiring.
4. Rinse the area thoroughly when completed.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 40 km/h (25 MPH).

1. Inspect for one tyre that has improper air pressure or improper size.

⇒	If not all the same pressure, adjust all tyre pressures to specification. If not all the same tire size, replace the incorrect tire. Verify the DTC does not reset.

2. Ignition OFF, disconnect the harness connector at the EBCM.
3. Ignition ON, test for less than 1 V between the ignition voltage circuit terminal of the appropriate sensor listed below and ground.

•	B5 Left front sensor circuit terminal 45

•	B5 Right front sensor circuit terminal 34

•	B5 Left rear sensor circuit terminal 36

•	B5 Right rear sensor circuit terminal 43

⇒	If greater than the specified range, test the ignition voltage circuit for a short to voltage.

4. Test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground.

•	B5 Left front sensor circuit terminal 46

•	B5 Right front sensor circuit terminal 33

•	B5 Left rear sensor circuit terminal 37

•	B5 Right rear sensor circuit terminal 42

⇒	If greater than the specified range, test the signal circuit for a short to voltage.

5. Ignition OFF, test for infinite resistance between the ignition voltage circuit terminal of the appropriate sensor listed below and ground.

•	B5 Left front sensor circuit terminal 45

•	B5 Right front sensor circuit terminal 34

•	B5 Left rear sensor circuit terminal 36

•	B5 Right rear sensor circuit terminal 43

⇒	If less than the specified value, test the ignition voltage circuit for a short to ground.

6. Ignition OFF, test for infinite resistance between the following signal circuit terminal of the appropriate sensor listed below and ground.

•	B5 Left front sensor circuit terminal 46

•	B5 Right front sensor circuit terminal 33

•	B5 Left rear sensor circuit terminal 37

•	B5 Right rear sensor circuit terminal 42

⇒	If less than the specified value, test the signal circuit for a short to ground.

7. Ignition OFF, disconnect the harness connector at the appropriate B5 wheel speed sensor.
8. Ignition OFF, test for less than 2 Ω between the appropriate ignition voltage circuit terminals listed below.

•	Left front sensor circuit terminal 45 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.

•	Right front sensor circuit terminal 34 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.

•	Left rear sensor circuit terminal 36 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.

•	Right rear sensor circuit terminal 43 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.

⇒	If greater than the specified value, test the ignition voltage circuit for an open or high resistance.

9. Test for less than 2 Ω between the appropriate signal circuit terminals listed below.

•	Left front sensor circuit terminal 46 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.

•	Right front sensor circuit terminal 33 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.

•	Left rear sensor circuit terminal 37 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.

•	Right rear sensor circuit terminal 42 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.

⇒	If greater than the specified value, test the signal circuit for an open or high resistance.

10. If all circuits test normal, replace the appropriate B5 wheel speed sensor. If the DTC resets, replace the K17 EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.