QuestionOn 11/8/2207 a Kathy asked a question about a 2004 S80 AWD. I wonder what the final out come was.
I'm having weird problems with and XC90. The dealer says it's the ABS module and I note you say they have a high failure rate but others are saying that post 2001 they have heard of no ABS Module failures.
I get Brake Failure Stop Safely, trip odometer at dashes, NO ABS or AWD then 3 minutes later it works again and the Ckeck Engine warning comes on and AWD and ABS work. Cruise may not work but if I stop and restart cruise works.
Codes and checks are
TECH READ CODES, STORED: ECM-6400, BRAKE PEDAL SENSOR SIGNAL MISSING. CEM-1A5E COMMUNICATIOW WITH SAS MODULE SIGNAL MISSING. CEM-1A5F, COMMUNICATION WITH BCM MODULE MISSING, FAULT TRACE AS PER VIDA INSTRUCTIONS. TEST FUSES 11B/14,11B/i9/11C/17, 11C/22, ALL FUSES-OK. CONNECT BREAK OUT BOX TO BQM, TEST VOLTAGE AT A=l, A=32, A=4, 12V-OK. TEST WITH 2AMP BULB AT GROUND POINTS A=l6, A=:47 - OK. CONNECT SCOPE AND CHECK CAN HIGH SIGANL AT A=11 AND CAN LOW SIGNAL AT A=15-0K. NO SHORT TO GROUND OR POSITIVE. CAN H MIN 2.00V, MAX 4.59, AVG. 2.96V. CAN L MIN .54V, MAX 3.23, AVG 2.10. CHECK POWER, GROUND AND CAN SIGNAL AT SAS MODULE. CAN A=6, 1.88V, 4.49V AVG 2.85V-OK, CAN LOW A=15 .71V-2.98V AVG 2.0V-OK, A=l VOLTAGE SUPPLY-12V. GROUND A=16-GOOD. NO SHORT TO GROUND OR POSITIVE. REMOVE WINDSHIELD COWL AND INSP PINS AT CONN 54/3 A&B INSP PINS AT CEM-OK. TECH DETERMINED VEHICLE WILL REQUIRE STEERING ANGLE SENSOR MODULE AND ABS CONTROL MODULE AS WELL AS RELEVANT SW
I have one person saying it's not the ABS but the BCM so now I don't know what it is and the deale will replace everything he can make a buck on and I could be replacing stuff that is just his guess and there's nothing wrong with it until he stumbles across what is actually wrong.
Answer David, this is simple. Ask them to gaurentee their repairs. Replace one part and retest. If that fixes it, I will pay you. If it doesn't, take out the wrong part and try again. The odds you have two bad modules are astronomical unless the car was hit by lightning or a power line fell on it. If they won't gaurentee their work, what are you doing there?
I would be looking at relays and power distribution first since the fuses are good. Very very unusual for a module to go intermittent. More likely a pin or a connector or a common ground point. If it was flat out failed I could believe it.
Mark
