Brake Control Module (BCM) Diagnostic Trouble Code (DTC) Diagnostics: Overview Volvo V70 II

Checking the operation of the pump motor

1. Ignition off
2. Check the brake control module (BCM) and pump motor connectors. Check for contact resistance and oxidation
3. Reconnect the components, connectors etc.
4. Ignition on
5. Activate the pump motor. Check that the pump motor starts and operates normally. If the pump motor starts and seems to operate normally, the cause of the fault was probably contact resistance and oxidation in the control module or pump motor connectors. Other information Disconnect the control module and pump motor. See «Checking wiring and terminals»(/volvo/v70/ii-2000-2004/remont/body-electrical/#electrical-general-diagnostics-and-tests)

Is the pump OK?

1. YES OKAY: Troubleshooting has been completed.
2. NO Refer to «Checking the wiring and component»(ref-406990-S42447073752011070100000)

Scheme 105

1. Ignition off. Check the circuit for the pump motor between brake control module (BCM) terminal #1 (#A1) and the fuse in the integrated relay/fusebox in the engine compartment. Check for an open-circuit. Check for a short-circuit to ground. Check the fuse for the brake system in the integrated relay / fusebox in the engine compartment. If the fuse is blown, check the cable between the fuse and control module terminal #1 (#A1). Check for a short-circuit to ground. Then replace the fuse. Remedy as necessary. Other information Connect the breakout box. See «Checking wiring and terminals»(/volvo/v70/ii-2000-2004/remont/body-electrical/#electrical-general-diagnostics-and-tests) For further information about the fuses and relays, see the relevant Wiring Diagram.

Was a fault detected?

1. YES Refer to «Verification»(ref-406990-S25007796552011070100000)
2. NO Refer to «Checking the pump motor circuit»(ref-406990-S28067195782011070100000)

Scheme 106

1. Ignition off
2. Remove the brake control module (BCM)
3. Connect adapter «9512856»(/volvo/v70/ii-2000-2004/remont/oem-general-information/#special-tools) to the power supply terminal on the pump motor
4. Connect the red fused cable to battery voltage. The black cable must be connected to ground. The pump motor must start when the cable is connected. Run for a maximum of 10 seconds. Replace the control module if the pump motor starts and seems to run normally. Replace the hydraulic unit if the pump motor does not start. Other information To replace the control module, see «Brake Control Module (BCM), replacing»(ref-406847-S13549546932011070100000) To replace the hydraulic unit, see «HYDRAULIC UNIT, REPLACING»(ref-406847-S21776300912011070100000).

1. Continue Refer to «Verification»(ref-406990-S25007796552011070100000)

1. Ignition off
2. Check the brake control module (BCM) and pump motor connectors. Check for contact resistance and oxidation
3. Reconnect the components, connectors etc.
4. Ignition on
5. Activate the pump motor. Check that the pump motor starts and operates normally. If the pump motor starts and seems to operate normally, the cause of the fault was probably contact resistance and oxidation in the control module or pump motor connectors. Other information To disconnect the control module and pump motor, see «Brake Control Module (BCM), replacing»(ref-406847-S13549546932011070100000) See «Checking wiring and terminals»(/volvo/v70/ii-2000-2004/remont/body-electrical/#electrical-general-diagnostics-and-tests)

Is the pump OK?

1. YES OKAY: Troubleshooting has been completed.
2. NO Refer to «Checking the wiring and component»(ref-406990-S38720959762011070100000)

1. Ignition off
2. Check the brake control module (BCM) and pump motor connectors. Check for contact resistance and oxidation
3. Reconnect the components, connectors etc.
4. Ignition on
5. Activate the pump motor. Check that the pump motor starts and operates normally. If the pump motor starts and seems to operate normally, the cause of the fault was contact resistance and oxidation in the brake control module (BCM) or pump motor connectors. Other information To disconnect the control module and pump motor, see «Brake Control Module (BCM), replacing»(ref-406847-S13549546932011070100000) See «Checking wiring and terminals»(/volvo/v70/ii-2000-2004/remont/body-electrical/#electrical-general-diagnostics-and-tests)

Is the pump OK?

1. YES OKAY: Troubleshooting has been completed.
2. NO Refer to «Checking the wiring and component»(ref-406990-S05414066722011070100000)

See also:
• Contents
• Checking wiring and terminals
• 9512856
• Central electronic module (CEM), replacing