Engine Block Heater - Timer Circuits: Other Volvo C70 I

Communication Fault

Communication has been interrupted for one of the following reasons

1. The ignition is switched off
2. VCT2000 disconnected from the data link connector (DLC)
3. VCT2000 disconnected from the VIDA cart
4. Communication problems in VIDA application or in car.
5. No voltage in the data link connector (DLC).

Check therefore

1. That the control module power supply and ground terminal are fault-free.
2. That the fuse for the data link connector (DLC) is intact.
3. that the ignition is on
4. that the battery voltage (system voltage) is normal (approximately 12 V). If necessary a battery charger can be connected during the test. For information about charge currents and the battery, see: «Battery, charging»(ref-408464-S13863486132011071200000)
5. that VCT2000 is correctly connected to the VIDA cart and the data link connector (DLC)
6. that VCT2000 and the wiring is fault-free.

Other information

1. For information about fuse and terminal numbers, see the relevant Wiring Diagram.

Try to establish communication again or exit reading off diagnostic trouble codes (DTCs). Depending on the communication fault, select one of the following options.

1. Try again Refer to: «Reading off ECC diagnostic trouble codes (DTCs)»(ref-439001-S25652387542011120700000)
2. Fault-trace more comprehensively for the communication problem that has occurred Refer to: «Checking communication errors»(ref-439001-S09025764262011120700000)
3. Exit fault-tracing / Read off from the next system.

Fault-Tracing Information

Fault-tracing communication problems is now finished.

Selecting Car Model

Refer to: Checking communication errors, car model V70 (-00), V70 XC and S70/C70

Checking Communication Errors, Car Model C70

HINT: Test the communication with another corresponding vehicle to decide if the malfunction is in the vehicle or in VIDA/VCT/cable harness. If the communication works on another vehicle, the malfunction is in the vehicle.

HINT: For current information about each circuit and signals, see wiring diagram and signal description for each system.

Diagnostic outlet

1. Check the voltage feed to diagnostic outlet #16. The voltage shall match battery voltage.
2. Check the cable for power ground and signal ground to diagnostic outlet #4 and #5.

HINT: When VCT2000 is connected to the diagnostic outlet (is supplied with voltage), the indicator diode shall be activated with a green light. Then the indicator diode flashes quickly when communication takes place with a control module. In case of certain internal malfunctions on VCT2000 the indicator diode is activated with a red light!

Communication cables

1. Check the communication cable (k-line) between diagnostic outlet #7 and the driver information module (DIM) #B4 and other connected control modules for open circuit, short-circuit to ground and short-circuit to voltage. CAUTION: In case of malfunction on this communication cable, communication cannot be established on the high-speed network. First when communication takes place on this cable, the high-speed cables between the diagnostic outlet and driver information module (DIM) are connected to the high-speed network in the vehicle. This is controlled via a relay in the driver information module (DIM).
2. Check communication cables between diagnostic outlet #6/#14 and the driver information module (DIM) #A19/#A20 for open circuit, short-circuit to ground and short-circuit to voltage according to references above.
3. Also check the communication cables for the high-speed network between the driver information module (DIM) and the other connected control modules according to troubleshooting above.

Communication cable for cruise control as own system (not integrated)

1. Check the communication cable between diagnostic outlet #13 and cruise control for open circuit, short-circuit to ground and short-circuit to voltage according to references above.

Communication cable for engine management system Fenix 5.2

1. Check the communication cable between diagnostic outlet #3 and engine control module (ECM) for open circuit, short-circuit to ground and short-circuit to voltage according to references above.

Control modules

1. Check that the control module's voltage feed and ground connection are trouble-free.

VCT2000 and cable harness

1. Connect VCT2000 to the vehicle so that it is supplied with voltage. Test VCT2000 by selecting the system's self-test and VCT Test in the VIDA main menu. If any malfunction is found according to the test, first replace the cable harness then the VCT2000, if the test still indicates a malfunction.
2. If no malfunctions were found after troubleshooting according to above, try with a new cable harness and/or new VCT2000.

VIDA

1. If no malfunctions were found after troubleshooting according to above, try performing a complete system reset of VIDA.

Other information

1. See «Contents»(ref-438953-S34713241302011120700000)

Scheme 5

Scheme 6

1. Continue Refer to: «Fault-tracing information»(ref-439001-S16141279682011120700000)

Scheme 7

The passenger compartment central electrical unit is located on the driver's side under the soundproofing panel.

Remove

1. battery negative lead.
2. soundproofing panel screws.
3. soundproofing panel.

Scheme 8

Replace relay. Position of relays as illustrated

Connect battery negative lead.

1. Test relay function.

Install soundproofing panel and screws.

Position of relays in passenger compartment central electrical unit

1. 201 Fog lamp relay.
2. 203 Intermittent windshield wiper.
3. 204 Intermittent rear windshield wiper.
4. 207 Exhaust temperature sensor.
5. 208 Rear defogger/heated door mirrors.
6. 212 Seat belt reminder/ Key reminder.
7. 213 Bridge front fog lamps.
8. 214 Heated rear seat.

Scheme 9

1. 3/6 , Switch hazard warning signal flasher with flasher relay
2. 11/13 , Fuse no. 13
3. 11/27 , Fuse no. 27
4. 31/50 , Ground terminal central electrical unit power ground
5. T1 , Heater unit
6. T3/3 , Timer type 3
7. T7 , Control relay 220 V.

Scheme 10

1. 3/6 , Switch hazard warning signal flasher with flasher relay
2. 11/13 , Fuse no. 13
3. 11/27 , Fuse no. 27
4. 31/50 , Ground terminal central electrical unit power ground
5. T3/3 , Timer type 3.

Scheme 11

1. 3/6 , Switch hazard warning signal flasher with flasher relay
2. 11/13 , Fuse no. 13
3. 11/27 , Fuse no. 27
4. 31/50 , Ground terminal central electrical unit power ground
5. T24/1 , Connector between the timer and fan connection (white 4-pin, under the dashboard)
6. T24/2 , Connector between the fan connection and heater (yellow 2-pin, under the dashboard)
7. T1 , Heater unit
8. T3/3 , Timer type 3
9. T4 , Parking heater control module
10. T5 , Switch electrical / fuel
11. T7 , Control relay 220 V.

Scheme 12

1. 3/6 , Switch hazard warning signal flasher with flasher relay
2. 11/13 , Fuse 13
3. 11/27 , Fuse 27
4. 31/50 , Ground terminal central electrical unit power ground
5. T24/1 , Connector between the timer and fan connection (white 4-pin, under the dashboard)
6. T24/2 , Connector between the fan connection and heater (yellow 2-pin, under the dashboard)
7. T1 , Heater unit
8. T3/3 , Timer type 3
9. T4 , Parking heater control module.

Scheme 13

1. 3/6 , Switch hazard warning signal flasher with flasher relay
2. 4/4 , Rheostat
3. 11/13 , Fuse no. 13
4. 17/10 , Data Link Connector (DLC) B
5. 31/50 , Ground terminal central electrical unit power ground
6. T24/1 , Connector between the timer and fan connection (white 4-pin, under the dashboard)
7. T3/4 , Timer type 4
8. T7 , Control relay 220 V
9. T8 , Alarm control module Volvo Guard I.

Scheme 14

1. 3/6 , Switch hazard warning signal flasher with flasher relay
2. 4/4 , Rheostat
3. 11/13 , Fuse no. 13
4. 17/10 , Data Link Connector (DLC) B
5. 31/50 , Ground terminal central electrical unit power ground
6. T24/1 , Connector between the timer and fan connection (white 4-pin, under the dashboard)
7. T24/2 , Connector between the fan connection and heater (yellow 2-pin, under the dashboard)
8. T3/4 , Timer type 4
9. T7 , Control relay 220 V
10. T8 , Alarm control module Volvo Guard I.

Scheme 15

1. 3/6 , Switch hazard warning signal flasher with flasher relay
2. 4/4 , Rheostat
3. 11/13 , Fuse no. 13
4. 17/10 , Data Link Connector (DLC) B
5. 31/50 , Ground terminal central electrical unit power ground
6. T24/1 , Connector between the timer and fan connection (white 4-pin, under the dashboard)
7. T24/2 , Connector between the fan connection and heater (yellow 2-pin, under the dashboard)
8. T3/4 , Timer type 4
9. T7 , Control relay 220 V
10. T8 , Alarm control module Volvo Guard I

Scheme 16

1. 3/6 , Switch hazard warning signal flasher with flasher relay
2. 4/4 , Rheostat
3. 11/13 , Fuse no. 13
4. 17/10 , Data Link Connector (DLC) B
5. 31/50 , Ground terminal central electrical unit power ground
6. T24/1 , Connector between the timer and fan connection (white 4-pin, under the dashboard)
7. T24/2 , Connector between the fan connection and heater (yellow 2-pin, under the dashboard)
8. T1 , Heater unit
9. T3/4 , Timer type 4
10. T4 , Parking heater control module
11. T5 , Switch electrical / fuel
12. T7 , Control relay 220 V
13. T8 , Alarm control module Volvo Guard I.

Scheme 17

1. 3/6 , Switch hazard warning signal flasher with flasher relay
2. 4/4 , Rheostat
3. 11/13 , Fuse no. 13
4. 17/10 , Data Link Connector (DLC) B
5. 31/50 , Ground terminal central electrical unit power ground
6. T24/1 , Connector between the timer and fan connection (white 4-pin, under the dashboard)
7. T24/2 , Connector between the fan connection and heater (yellow 2-pin, under the dashboard)
8. T1 , Heater unit
9. T3/4 , Timer type 4
10. T4 , Parking heater control module
11. T8 , Alarm control module Volvo Guard I.

Activating Components/Functions

This function makes it possible to operate the seat using the arrow keys on the Volvo Scan Tool (ST).

Reading Off Input And Output Signals

This function makes it possible to read off the value on all the control module's inputs and outputs.

1. Supply voltage
2. The control module's relays (outputs to motors)
3. The potentiometers values
4. The motors' speed
5. The buttons on the control panel

For more information Refer to: Volvo Scan Tool (ST) Scrolling values .

Reading The Control Module ID

The Volvo Scan Tool (ST) identifies control modules by reading a code from the control module memory. The code contains information on the part number of the control module and the software version it is using.