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Brake Control System - Specifications, Electrical/electronic (Convertible): Overview Volvo C70 I

Anti-Lock/traction Control 4 illustrations ~300 words

Signal description ABS

All the values shown are between the connection shown in column 1 and connection #8 or #24 (ground), except where shown in brackets

Note. It is important to connect the test box and check the contact points as per Connecting the breakout box before starting testing

U= DC voltage, volts (V) Ubat= Battery voltage (V) Ulow= Voltage close to 0 V UAC= AC voltage (V)

Conn.Signal typeIgnition on/idlingOther notes
#1Signal (-) wheel sensor RH rearU approx. 2, 3V
#2Signal (-) wheel sensor LH rearU approx. 2, 3 V
#3Signal (+), wheel sensor RH frontU approx. 2, 3 VUAC increases with wheel speed Min 150 mV AC when wheel speed is 1 r/s
#4Signal (+) wheel sensor LH frontU approx. 2, 3 VUAC increases with wheel speed Min 150 mV AC when wheel speed is 1r/s
#5Signal (+) EBD-pressure sensorClosed: U = 5 - 6 V Open: 1 - 2 V less than UbatPressure sensor opens when braking hard
#6Signal Speed (To instrument panel)U = 0 - U batVoltage depends on position of front wheel
#7Signal (-) EBD-pressure sensorOpen: U approx. Ul g Closed: U = 5 - 6 VPressure sensor opens when braking hard
#8Ground (measured towards the battery negative terminal)U approx. Ulow
#930-supply Inlet and outlet valves (Voltage from battery to inlet and outlet valves)U approx. UbatVoltage to inlet and outlet valves and signal to control module on voltage supply to inlet and outlet valves
#10Signal (+) wheel sensor LH rearU approx. 2, 3 VUAC increases with the wheel speed min 150 mV AC when wheel speed is 1 r/s
Conn.Signal typeIgnition on/idlingOther notes
#11Signal (-) wheel sensor LH frontU approx. 2,3 V
#12Signal Brake light switchOpen: U = Ulow Closed: U =UbatBrake light switch cuts out on braking
#13Data Link ConnectorU approx. 1 - 2 V under UbatNote: Other voltages apply if the Volvo System Tester is connected to the Data Link Connector
#14
#15Signal TRACS control signal circuit switch TRACS warning lightLight on: U = 0 -7 V Light off: U = Ubat Switch pressed: U = UlowThe signal is grounded when the switch is pressed, TRACS is switched on/off. If the TRACS warning light comes on, TRACS is disabled.
#16ABS control signal warning lightLight on: U over approx. 7V Light off: U = UlowIf the control module grounds the signal, the ABS warning light goes out. The warning light comes on if the control module increases voltage over 7V
#17Signal (+) wheel sensor RH rearU approx. 2,3 VUAC increases with the wheel's speed Min 150 mV AC at a wheel speed of 1 r/s
#18Signal (-) wheel speed RH frontU approx. 2,3 V
#19
#20
#21
#22
#2315I- supply (voltage supply from ignition switch)U approx. Ubat
#24Ground (measured relative to battery negative terminal)U approx. Ulow
#2530-supply pumpmotor (voltage supply from battery)U approx. Ubat

Scheme 71

Scheme 71: Connecting the breakout box
Scheme 71: Connecting the breakout box

Scheme 72

Scheme 72
Scheme 72
  1. Ignition off.
  2. Disconnect the ABS control module by pressing in the catch on the rear edge of the cover (wheel arch side). Carefully turn the cover upwards so that the locking catches release.
  3. Check control module and control module connector to ensure that: Male and female terminals are undamaged and properly attached (cannot be pressed in). Female terminal cables are correctly connected to the terminals.
  4. Pay particular attention to the terminals related to the diagnostic trouble code (DTC)/symptom.
  5. Connect adapter «9511354»(ref-403953-S42125593172011061000000) to the control module connector (wiring side) and connect breakout box «9511428»(ref-403953-S35709646712011061000000) to the adapter.
  6. Control module disconnected.
  7. Then check ground terminals.
  1. Continue Refer to «Checking ground terminals»(ref-404006-S09658857642011092000000)

Scheme 73

Scheme 73
Scheme 73

Scheme 74

Scheme 74
Scheme 74
  1. Ignition off.
  2. Switch off all equipment that takes power from the battery (courtesy lighting, radio etc). Connect an ohmmeter between battery negative terminal and #8 and #24 on the breakout box.

The ohmmeter should read approximately 0 ohms for all readings.

  1. OK Refer to «Reading is OK»(ref-404006-S22453016132011092000000)
  2. NOT OK Refer to «Value is not OK»(ref-404006-S12891121022011092000000)

Signal description, Control unit for the steering wheel angle sensor (SAS)

The values in the table represent the values between the connections shown in column 1 and #A40 (ground), unless otherwise stated in brackets.

Note. It is important that the test box is connected and the ground points checked before testing begins.

U=DC voltage (V)Ubat =Battery voltage (V)
I =Amperage (A)Ulow =Voltage close to 0 V
Test box connectionControl unit connectionSignal typeIgnition onOther
#A25#115 supply (voltage supply from the ignition lock)U (Ubat)
#A26#2Voltage supply to steering wheel angle sensorU(Ubat)15 supply through control unit
#A27#3Steering wheel angle signal A<0.25 V (low) >0.75 V (high) I (1 mA)Steering wheel angle signal The coding wheel in the steering wheel angle sensor is perforated with a special code template. Two circuits, each with 4 LEDs and 4 receptors, read the coding wheel and send a pulsed signal containing information about the position of the steering wheel.
#A28#4Steering wheel angle signal B<0.25 V (low) >0.75 V (high) I (1 mA)Steering wheel angle sensor signal For more information, see steering wheel angle signal A.
#A29#5Steering wheel position signal R1<0.25 V (low) >0.75 V (high) I(1 mASector identifier For more information, see steering wheel angle signal A.
#A30#6Control unit communication wire (CAN H)U=2-3 VCAN High speed, Multiplex wire.
#A31#7Signal and power ground for steering wheel angle sensor
#A32#8LED circuit 2 signalLED circuit 2 current test
#A33#9LED circuit 1 signalLED circuit 1 current test
#A34#10Steering wheel angle signal IX<0.25 V (low) >0.75 V (high) I(1 mASteering wheel angle sensor signal For more information, see steering wheel angle signal A.
#A35#11Steering wheel angle signal IY<0.25V (low) >0.75 V (high) I(1 mASteering wheel angle sensor signal For more information, see steering wheel angle signal A.
#A36#12Steering wheel position R2 signal<0.25 V (low) >0.75 V (high) I(1 mASector identifier For more information, see signal A.
#A37#13Steering wheel position R3 signal<0.25 V (low) >0.75 V (high) I(1 mASector identifier For more information, see signal A.
#A38#14Steering wheel position R4 signal<0.25 V (low) >0.75 V (high) I(1 mASector identifier For more information, see signal A.
#A39#15Control unit communication wire (CAN L)U=2-3 VCAN Low speed, Multiplex wire.
#A40#16Signal and power ground (measured against the battery negative terminal).U (Ulow)

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