I was driving in the snow the other day and when I hit the brakes I slid. This caused my ABS to kick in but after that I got a service ABS and service traction control. I unhooked the battery to try and clear it but it came back. I have topped off the brake fluid but that also did not help. My brakes seem to be working just fine. Any suggestions? I really dont want to have to take it to the dealer.

 

do a search for clearing DTC (diagnostic trouble codes) codes. You can clear them by using a sequence of the buttons on the Drivers Info Center ( fuel, gages, options, etc buttons). Then see if the lights come back on

 

Youy might have to clean off the ABS sensors. I had the same problem, I cleaned them up slapped some dia telectic(SP) grease on them and no more light.

 

See :

https://www.corvetteforum.com/techti...D=26&TopicID=1

For more information on how to read and/or delete the codes. If the problem persists, post the codes and someone will help you out with it.

 

I did the diagnostic and got the code. It was this:C1217 BPMV Pump Motor Relay Contact CKT Open. I cleared it and started my car right after. It came back. Does anyone know what this BPMV pump motor is?

 

I do not know what the bpmv is but do to the conditions your problem occured in (I have had the abs/traction control codes come on due to wet weather, which I think is my ebtcm unit malfuntioning which appears to be common) it may possibly be moisture in your connections or a poor ground. There is a sticky on the grounds by Bill Curlee about the grounds to check. I hope this helps___Eric

 

Got the same two messages yesterday morning ("Service Active Handlng" & "Service ABS") on the DIC, as well as the lights on the gauge cluster that are staying on. I had just installed a new battery prior to this. Never had the messages before installing the battery so could they be related? How/should can I get rid of them or should I take it in for service?

 

Clearing the codes/messages is not done by hitting the reset button or pulling a battery cable. The codes/messages come on because there was an out of range reading somewhere in the system. To get rid of the code/message you need to determine what caused the out of range reading and fix it.

On cars with Active Handling or 99 and newer cars with only TC the BPMV is attached to the EBCM and both of them are located on the drivers side down slightly below and to the left of the power steering reservoir. The BPMV is the one with all of the brake lines going to it.

If you have a 97 or have a 98 without AH then the unit is located to the left of the differential.

What year car do you have and do you just have Traction Control or do you have Traction Control plus Active Handling. Active Handling was standard on all 2001 and newer cars and optional on 98 through 2000 cars. Its option code is JL4.

Bill

 

Bill,

My '98 must have Active Handling since it came up on the DIC as "Service Active Handling". All it has is the switch on the center console however, which I thought was just traction control.

 

BPMV = Brake Pressure Modulator Valve.

On the Corvette the computer that controls the ABS also controls some other functions. That computer is the EBCM (Electronic Brake Control Module). It controls modulation of the brakes for Active Handling, Traction Control, ABS etc. by using the BPMV as its "muscle" to modulate/control hydraulic pressure to the calipers.

C1217 causes the EBCM to disable ABS, Traction Control, and Active Handling for that ignition cycle. It of course turns on the appropriate warning lamps and issues the SERVICE ABS and other warning messages to the DIC.

Generally the pump motor has failed in the BPMV and the unit (the internals of the BPMV are not a servicable item - the whole BPMV) must be replaced. Depending on what year Corvette you have will determine which part you need as I believe there are at least two different parts for the C5.

I can post the diagnostics, but they are mainly wiring tests (checking connectors to the EBCM, etc.) and usually you end up at Step 6 .... replace the BPMV.

HTH

 

Is it possible that replacing the battery could trigger this problem and not the BPMV? I didn't have a problem until I replaced the battery.

 

It wouldn't hurt to go back over the battery connections to see whether or not you have a corroded or loose connection. The TC button controls both AH and TC. If you push it once you turn off both AH and TC however if you are stopped and hold it down for 15 seconds or so it will put the car into Competitive Handling mode.

As indicated above most of the diagnostic checks are related to wiring and the wiring should be checked out before replacing any modules. Most likely cause is a wiring or connection problem not module failure. However, since this seemed to pop up after the battery was replaced I would also check the two ABS fuses under the hood. Sometimes you can get current surges when connecting a battery. The other thing to check is the Ground at G108 it is under the battery.

DTC C1217 Pump Motor Relay Contact Circuit Open Front Mounted EBTCM/BPMV



Circuit Description
The pump motor is an integral part of the BPMV, while the pump motor relay is integral to the EBTCM. The pump motor relay is not engaged during normal system operation. When an ABS/TCS/Active Handling (if equipped with RPO JL4) operation is required, the EBTCM activates the pump motor relay and battery power is provided to the pump motor.

Conditions for Setting the DTC
DTC C1217 will set anytime the pump motor relay is commanded on and the pump relay voltage is less than 8 volts, and ignition voltage is greater than 10.5 volts.

Action Taken When the DTC Sets
ABS/TCS/Active Handling (if equipped with RPO JL4) are disabled.

Indicators that turn on:
ABS indicator
Car Icon (TCS indicator)
Messages displayed on the DIC:
Service ABS
Service Traction System
Service Active HNDLG (if equipped with Active Handling RPO JL4)
Conditions for Clearing the DTC
Condition for DTC is no longer present and scan tool clear DTC function is used.
Fifty ignition cycles have passed with no DTCs detected.
Diagnostic Aids
It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
If an intermittent malfunction exists refer to Testing for Electrical Intermittents in Wiring Systems.
Test Description
The numbers below refer to step numbers on the diagnostic table.

Checks for a short to ground in CKT 1642.

Checks for an internal short in the BPMV.

Checks for an open in CKT 1642.

DTC C1217 Pump Motor Relay Contact Circuit Open Step
Action
Value(s)
Yes
No

1
Was the Diagnostic System Check performed?
--
Go to Step 2
Go to Diagnostic System Check

2
Inspect the 40A ABS Maxifuse®, in the Underhood Electrical Center.

Is the fuse OK?
--
Go to Step 7
Go to Step 3

3
Install a new 40A ABS Maxifuse®.
Cycle the ignition switch from the OFF to ON position, engine off.
Using a scan tool in ABS/TCS or ABS/TCS/Active Handling Special Functions attempt to run the AUTOMATED test.
Recheck the 40A ABS Maxifuse® fuse.
Is the fuse OK?
--
Go to Diagnostic System Check
Go to Step 4

4
Turn the Ignition switch to the OFF position.
Remove the 40A ABS Maxifuse®.
Disconnect the EBTCM.
Disconnect the pump motor ground.
Connect the J 39700 Universal Pinout Box using the J 39700-25 cable adapter to the EBTCM harness connector only.
Using J 39200 DMM, measure the resistance between terminals E and B of J 39700 .
Is the resistance within the range specified in the value(s) column?
OL (infinite)
Go to Step 5
Go to Step 10

5
Remove the EBTCM from the BPMV.
Connect the J 41247 Pinout Box to the BPMV.
Measure the resistance between J 41247 terminal 8 and the BPMV case.
Is the resistance within the range specified in the value(s) column?
OL (infinite)
Go to Step 9
Go to Step 6

6
Replace the BPMV. Refer to Brake Pressure Modulator Valve (BPMV) Replacement .

Is the replacement complete?
--
Go to Diagnostic System Check
--

7
Install the fuse if removed.
Using J 39200 DMM, measure the voltage at the 40A ABS Maxifuse® fuse by probing between the fuse test terminals and a good ground.
Is the voltage within the range specified in the value(s) column?
Battery volts
Go to Step 8
Go to Power Distribution Wiring Systems

8
Turn the Ignition switch to the OFF position.
Disconnect the EBTCM.
Connect J 39700 Universal Pinout Box using the J 39700-25 cable adaptor to the EBTCM harness connector only.
Using J 39200 DMM, measure the voltage at terminal E of J 39700 .
Is the voltage within the range specified in the value(s) column?
Battery volts
Go to Step 9
Go to Step 11

9
Replace EBTCM. Refer to Electronic Brake Control Module (EBCM) Replacement .

Is the replacement complete?
--
Go to Diagnostic System Check
--

10
Repair short to ground in CKT 1642. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?
--
Go to Diagnostic System Check
--

11
Repair open in CKT 1642. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?
--
Go to Diagnostic System Check
--

Bill

 

Thanks again for the info. In addition to replacing the battery, I also swapped out the original AM/FM Casette radio with an OEM Bose AM/FM Cd head unit, which required disconnecting the TA switch under the console plate. I re-checked the connection yesterday and it seemed secure. Could this have triggered the DIC messages as well? Forgot all about that and didn't drive the car after the swap until yesterday.

 

I'm not sure if they are this way on all the pre '01s, but my 2000 model says Active Handling over the traction control button.

 

You guys rock. This is the best forum I have been on for a car. I checked the fuses(you would think I would go there first since I work in the electronics field):o I checked fuse 52 under the hood. It is one of the big "maxifuses" located under the hood. It is also the one for the ABS. It is blown.

Next question: Do you think this blew because of another faulty part of just because I was sliding on ice when the error occurred?

I'm heading to autozone in the morning to find one of these fuses.

Thanks again guys.

 

hey where is the ebcm connectors at?

 

Bill, AH was an option(JL4) beginning in 98 as you suggest. They changed the location of the BPMV from rear to front in mid-year 98 regardless whether you have the AH option or not. I have a 98 with front-mounted BPMV without AH. One other thing: when I get the ABS, TC errors I also get the AH error even though I don't have that option. I occasionally get these errors during loss of traction with Traction Control enabled. Rather than pull off the road and turn off the ignition key to reset them, I simply turn the key to the start position while driving to clear them. Your PCM is smart enough to know it doesn't need to activate the starter. Hope this is helpful for those of you that suffer with this PITA TC/AH/ABS disease.
John

 

It's times like these that make me wish for a cherry '67 coupe -
NO ELECTRONIC GREMLINS!!!!