V70 Brakes: - 2003 v70 D5244T Rear ABS sensor

jimbo66 · Mar 20th, 2019, 14:56

BCM-0031 from my code reader - wheel sensor left rear, faulty signal.
silly question, is the left the drivers side ( UK ). sensor looks clean and undamaged. Car has covered nearly 200k and is about to be serviced, MOT'd, and have a cambelt kit done. I dont want to do the rest of the stuff if i cant sort the ABS error out. Are the sensor connections under the rear passenger seat ?

Any advice gratefully receved.

Dancake · Mar 20th, 2019, 15:13

There is a connector under the rear passenger seat, but also have a look at your wheel bearing. The bearing functions as the reluctor ring, using a series of magnets. A worn wheel bearing can cause ABS faults. To test the wiring of the sensor, you would need to perform a resistance check between the ABS module and the plug under the rear seat.

jimbo66 · Mar 21st, 2019, 08:12

Left side is nearside, it would appear. Unplugged rear nearside sensor and got error BCM-0030 - left rear sensor no signal. so BCM is able to detect sensor is present ( resistance ? ). Does this mean sensor is ok ?. The wheel bearing has no discernable play and rotates smoothly. How easy is a bearing swap on these ?

jimbo66 · Mar 21st, 2019, 16:58

this was indeed the nearside rear ABS sensor. A straight forward replacement too as it turned out.

Mar 20th, 2019, 14:56	#1
jimbo66 New Member Last Online: Mar 24th, 2022 15:40 Join Date: Sep 2018 Location: Leicester	2003 v70 D5244T Rear ABS sensor BCM-0031 from my code reader - wheel sensor left rear, faulty signal. silly question, is the left the drivers side ( UK ). sensor looks clean and undamaged. Car has covered nearly 200k and is about to be serviced, MOT'd, and have a cambelt kit done. I dont want to do the rest of the stuff if i cant sort the ABS error out. Are the sensor connections under the rear passenger seat ? Any advice gratefully receved.

Mar 20th, 2019, 15:13	#2
Dancake Premier Member Last Online: Today 01:43 Join Date: Apr 2011 Location: Belfast	There is a connector under the rear passenger seat, but also have a look at your wheel bearing. The bearing functions as the reluctor ring, using a series of magnets. A worn wheel bearing can cause ABS faults. To test the wiring of the sensor, you would need to perform a resistance check between the ABS module and the plug under the rear seat. __________________ 1996 850 T5 - Sold 2003 S40 1.9d - Sold 2004 S60 D5

Mar 21st, 2019, 08:12	#3
jimbo66 New Member Last Online: Mar 24th, 2022 15:40 Join Date: Sep 2018 Location: Leicester	2003 v70 D5244T Rear ABS sensor Left side is nearside, it would appear. Unplugged rear nearside sensor and got error BCM-0030 - left rear sensor no signal. so BCM is able to detect sensor is present ( resistance ? ). Does this mean sensor is ok ?. The wheel bearing has no discernable play and rotates smoothly. How easy is a bearing swap on these ?

Mar 21st, 2019, 16:58	#4
jimbo66 New Member Last Online: Mar 24th, 2022 15:40 Join Date: Sep 2018 Location: Leicester	BCM-0031 Solved this was indeed the nearside rear ABS sensor. A straight forward replacement too as it turned out.

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