Checking Control Module Communication
XB1 Checking Power Supply:
- Ignition on.
- Volvo Scan Tool (ST) connected to data link connector (DLC).
Power up the Volvo Scan Tool (ST) and check that the display lights. Does the display light?
Yes: XS3
No: XB2
XB2 Checking Volvo Scan Tool (ST):
Check the Volvo Scan Tool (ST), power supply and data link connector (DLC) ground. Then continue with XB23.
XB3 Checking Communication with the ABS System:
- Ignition on.
- Volvo Scan Tool (ST) connected to data link connector (DLC).
Try to establish communication with the ABS system. Has communication been established?
Yes: XB4
No: XB15
XB4 Checking the Combined Instrument Panel:
Engine Running:
- Start engine.
- Check that the tachometer is working. Is it?
Yes: XB5
No: XB6
XB5 Checking for an Open-Circuit:
Check cable between data link connector (DLC) terminal 7 and combined instrument panel # B4 for an open- circuit according to ZA2. Permanent Faults Then continue with XB23.
XB6 Checking 15-Supply Before Fuse:
- Ignition on.
- Remove fuse 11/2.
- Connect a voltmeter between the rear output (positive side) on the fuse holder of fuse 11/2 and ground. The voltmeter should read approximately battery voltage.
If reading is OK: XB8
If reading is incorrect: XB7
XB7 Checking for an Open-Circuit:
Check cable between the rear output (positive side) on the fuse holder to fuse 11/2 and the battery for an open-circuit according to ZA2. Permanent Faults Check function of overload relay 2/31 and ignition switch. Then continue with XB23.
NOTE: For further information about the circuit, see Wiring Diagram.
XB8 Connecting Breakout Box and Checking Ground Terminal:
- Ignition off.
- Reinstall fuse 11/2
- Connect breakout box and check ground terminal according to "Connecting the Breakout Box." Connecting the Breakout Box Was ground terminal OK?
Yes: XB1O
No: XB9
XB9 Corrective Action:
Remedy fault if not already carried out. Then continue with XB23.
XB10 Checking 15 supply to Combined Instrument Panel:
- Ignition off.
- Connect combined instrument panel.
- Ignition on.
- Connect a voltmeter between # 15 (# A15) and # 18 (# A18) on the breakout box. The voltmeter should read approximately battery voltage.
If reading is OK: XB12
If reading is incorrect: XB11
XB11 Checking for an Open-Circuit:
Check cable between the rear output (positive side) on the fuse holder to fuse 11/2 and combined instrument panel # A18 for an open-circuit according to ZA2. Permanent Faults Then continue with XB23.
XB12 Checking Fuse on Combined Instrument Panel Connection Plate:
- Ignition off.
- Check fuse on combined instrument panel connection plate according to DDI. Replacing Fuse. Service and Repair Was the fuse defective?
Yes: XB13
No: XB14
XB13 Checking for a Short-Circuit and Replacing Component:
Check circuit after fuse on the connection plate for a short-circuit to ground according to ZA3. Permanent Faults
NOTE: For information about the circuit after the fuse, see Wiring Diagram.
Replace fuse and reinstall combined instrument panel according to DDI. Replacing Fuse. Service and Repair Then continue with XB23.
XB14 Fault Cause and Checking for Contact Resistance and Oxidation:
The cause of the fault has been loose connections in the combined instrument panel connectors. Check combined instrument panel connectors for contact resistance and oxidation and remedy according to ZA5. Permanent Faults Then continue with XB23.
XB15 Checking Communication Cable to Data Link Connector (DLC):
- Ignition off.
- Connect breakout box and check ground terminal according to "Connecting the Breakout Box." Connecting the Breakout Box
- Connect an ohmmeter between data link connector (DLC) terminal 7 and # 34 (# B4) on the breakout box. The ohmmeter should read approximately 0 Ohms.
If reading is OK: XB17
If reading is incorrect: XB16
XB16 Checking for an Open-Circuit:
Check cable between data link connector (DLC) terminal 7 and combined instrument panel # B4 for an open- circuit according to ZA2. Permanent Faults Then continue with: XB23
XB17 Checking the Communication Cable:
- Ignition off.
- Connect combined instrument panel.
- Ignition on.
Connect a voltmeter between data link connector (DLC) terminal 7 and ground. The voltmeter should read approximately 9 - 11 V.
If reading is OK: XB20
If value is lower: XB18
If value is higher: XB19
XB18 Checking for a Short-Circuit to Ground:
Check cables between data link connector (DLC) terminal 7 and control modules connected to this cable for a short-circuit to ground according to ZA3. Permanent Faults Then continue with XB23.
NOTE: For further information about the circuit, see Wiring Diagram.
XB19 Checking for a Short-Circuit to Supply Voltage:
Check cables between data link connector (DLC) terminal 7 and control modules connected to this cable for a short-circuit to supply voltage according to ZA4. Permanent Faults Then continue with XB23.
NOTE: For further information about the circuit, see Wiring Diagram.
XB20 Checking Communication with the Combined Instrument Panel:
- Ignition on.
- Volvo Scan Tool (ST) connected to data link connector (DLC).
- Try to establish communication with the combined instrument panel. Has communication been established?
Yes: XB21
No: XB22
XB21 Fault Cause and Checking for Contact Resistance and Oxidation:
The cause of the fault has been loose connections in the data link connector (DLC) and/or combined instrument panel connectors.
Check data link connector (DLC) and combined instrument panel connectors for contact resistance and oxidation and remedy according to ZA5. Permanent Faults Then continue with: XB23
XB22 Checking Volvo Scan Tool (ST):
Volvo Scan Tool (ST):
Check Volvo Scan Tool (ST). Then continue with XB23.
XB23 Verification:
After carrying out the repair check that the fault has been remedied.
- Ignition off.
- Reconnect connectors, reinstall components.
- Combined instrument panel connected.
- Ignition on.
- Volvo Scan Tool (ST) connected to data link connector (DLC).
- Try to establish communication with the combined instrument panel. Has communication been established?
Yes: Fault corrected
No: Fault not found