GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Park Avenue 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C1263 RF Inlet Valve Solenoid Malfunction

Object Number: 397526 Size: MF
ABS Components
Cell 44: PWR, GND, EBCM/EBTCM, BPMV Motor and Solenoids
Handling ESD Sensitive Parts Notice
Cell 44: PWR, GND, EBCM/EBTCM, BPMV Motor and Solenoids

Circuit Description

The valve solenoid circuits are supplied with battery power when the ignition is ON. The EBCM/EBTCM controls the valve functions by grounding the circuit when necessary.

Conditions for Setting the DTC

The EBCM/EBTCM senses a discrepancy such as an open, short to ground, or short to voltage in the circuit.

Action Taken When the DTC Sets
    • A malfunction DTC is stored.
    • The ABS/TCS is disabled.
    • The ABS indicator isturned ON.
    • The TRACTION OFF indicator is turned ON.

Conditions for Clearing the DTC
    • The condition for the DTC is no longer present and you used the scan tool Clear DTC function.
    • The EBCM/EBTCM does not detect the DTC in 50 drive cycles.

Diagnostic Aids

Make sure the integrity of the connection between the EBCM/EBTCM and the BPMV is secure, tight, and free from corrosion.

Test Description

The numbers below refer to step numbers on the diagnostic table.

  1. This step tests the resistance value of the solenoid.

    2.

  2. This step tests for a short to ground in the BPMV.

    3.

  3. This step tests for an internal short to voltage.

Step

Action

Value(s)

Yes

No

1

Was the ABS Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - ABS

2
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the EBCM/EBTCM connector.
  3. Remove the EBCM/EBTCM from the BPMV.
  4. Inspect the EBCM/EBTCM to BPMV connector for conditions which could cause intermittents such as damage, corrosion, or poor terminal contact.

Are the internal connectors OK and is the cavity free of brake fluid?

--

Go to Step 3

Go to Step 6

3

  1. Install the J 41247 BPMV pinout box to the BPMV connector.
  2. Using the J 39200 digital multimeter (DMM), measure the resistance between the J 41247 terminal 1 and terminal 7.

Is the resistance equal to the specified value?

8-12 ohms

Go to Step 4

Go to Step 8

4

Using the J 39200 DMM, measure the resistance between the J 41247 terminal 1 and the BPMV case.

Is the resistance equal to the specified value?

OL (Infinite)

Go to Step 5

Go to Step 8

5
  1. Remove the J 41247 .
  2. Reinstall the EBCM/EBTCM to the BPMV.
  3. Reconnect the EBCM/EBTCM connector.
  4. Turn the ignition switch to the RUN position with the engine OFF.

Does DTC C1263 reset as a current DTC?

--

Go to Step 9

Go to Step 7

6
  1. If connector corrosion or damage are present, replace the BPMV and/or the EBCM/EBTCM as needed.
  2. If brake fluid is present, replace both the BPMV and the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement or Brake Pressure Modulator Valve Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

7

Using a scan tool in the ABS/TCS Special Functions, run the AUTOMATED test.

Does DTC C1263 reset as a current DTC?

--

Go to Step 8

Go to Diagnostic System Check - ABS

8

Replace the BPMV. Refer to Brake Pressure Modulator Valve Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

9

Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--