Rear Electronic Module (REM) & Upper Electronics Module (Uem) Diagnostic Trouble Codes (Xc): Diagnosis Volvo V70 II

Diagnostic trouble code (DTC) information REM-6C15

Condition

The rear electronic module (REM) receives signals from the inclination sensor module (ISM) when the alarm is activated. Before the rear electronic module (REM) accepts signals from the inclination sensor module (ISM) a communication test is carried out after the alarm is activated.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) registers that communication with the inclination sensor module (ISM) is not working.

The diagnostic trouble code (DTC) can be diagnosed when the rear electronic module (REM) is in alert mode.

Substitute Value

1. None.

Possible Source

1. Contact resistance or oxidation in the connectors
2. Open-circuit in the communication cable to the inclination sensor module (ISM)
3. Open-circuit in the power supply to the inclination sensor module (ISM)
4. Open-circuit in the ground cable to the inclination sensor module (ISM).

Fault symptom[s]

1. Does not alarm the sensor.

Diagnostic trouble code (DTC) information REM-6C16

Condition

The rear electronic module (REM) receives signals from the inclination sensor module (ISM) when the alarm is activated. Before the rear electronic module (REM) accepts signals from the inclination sensor module (ISM) a communication test is carried out after the alarm is activated.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) receives information from the inclination sensor module (ISM) indicating an internal fault.

The diagnostic trouble code (DTC) can be diagnosed when the rear electronic module (REM) is in alert mode.

Substitute Value

1. None.

Possible Source

1. Contact resistance or oxidation in the connectors
2. Open-circuit in the communication cable to the inclination sensor module (ISM)
3. Open-circuit in the power supply to the inclination sensor module (ISM)
4. Open-circuit in the ground cable to the inclination sensor module (ISM)
5. Internal fault in the inclination sensor module (ISM).

Fault symptom[s]

1. Does not alarm the sensor.

Diagnostic trouble code information

Condition

If the rear electronic module registers that an internal fault has occurred in the level sensor, diagnostic trouble code REM-6C16 is displayed.

Substitute Value

Nothing.

Possible Source

1. Faulty sensor.

Fault symptom[s]

1. No alarm from sensor.

See Diagnostic trouble code information

Diagnostic trouble code (DTC) information REM-6C17

Condition

When the alarm is activated, the central electronic module (CEM) checks the glass breakage loops in the rear side windows at regular intervals. A diagnostic trouble code (DTC) is stored if the control module detects an open-circuit in any of the glass breakage loops.

The diagnostic trouble code (DTC) can be diagnosed when the alarm is activated.

Substitute Value

1. The alarm sounds.

Possible Source

1. Open-circuit in one of the glass breakage loops in the rear side windows
2. Contact resistance in the terminals.

Fault symptom[s]

1. Text window and warning symbol/Text message
2. Alarm/False alarm
3. Alarm/Other alarm problems

Diagnostic trouble code (DTC) information REM-6C18

Condition

When the alarm is activated, the central electronic module (CEM) checks the glass breakage loops in the rear side windows at regular intervals. The diagnostic trouble code (DTC) is stored if the control module registers a short-circuit to supply voltage in any of the glass breakage loops.

The diagnostic trouble code (DTC) can be diagnosed when the alarm is activated.

Substitute Value

1. The alarm sounds.

Possible Source

1. Short-circuit to supply voltage in one of the glass breakage loops in the rear side windows.

Fault symptom[s]

1. False alarm.

Diagnostic trouble code (DTC) information REM-6F51

Condition

Scheme 1848

The rear electronic module (REM) is grounded when a switch on the tailgate is pushed in.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) registers that the switch on the tailgate has been activated for more than 20 seconds.

Substitute Value

1. None.

Possible Source

1. The switch for the tailgate has stuck in the activated position
2. Short-circuit to ground in the cable for the tailgate switch.

Fault symptom[s]

1. No locking/unlocking of the tailgate.

Condition

If rear electronic module registers signal too low from boot lid handle for more than 20 seconds, diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Handle push button has stuck in an activated position.
2. Signal wire short circuited to ground.

Fault symptom[s]

1. Boot lid will not open/lock.

See Diagnostic trouble code information

Condition

If rear electronic module registers signal too high on relay coil ground circuit when unlocking, diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Faulty relay (short circuit in relay coil).
2. Defective control unit.

Fault symptom[s]

1. The boot lid will not lock/open.

See Diagnostic trouble code information

See Diagnostic trouble code information

Condition

If the rear electronic module registers no signal/signal too low on relay coil ground circuit diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Oxidation of relay socket contacts.
2. Relay is loose or missing.
3. Faulty relay (open circuit/short circuit to ground in relay coil).
4. Defective control unit.

Fault symptom[s]

1. The boot lid will not lock/open.

See Diagnostic trouble code information

See Diagnostic trouble code information

Diagnostic trouble code (DTC) information

Condition

Diagnostic trouble code (DTC) REM-6F55 is stored if the signal across the relay coil (2/86) is too high during activation.

Substitute Value

None.

Possible Source

1. Short-circuit to supply voltage in the relay coil.

Fault symptom[s]

1. Does not lock / unlock the trunk lid.

See Diagnostic trouble code (DTC) information

Condition

Diagnostic trouble code (DTC) REM-6F56 is stored if the signal across the relay coil (2/86) is too low during activation.

Substitute Value

None.

Possible Source

1. The relay is not installed.
2. Open-circuit in the relay coil.
3. Short-circuit to ground in the relay coil.

Fault symptom[s]

1. Does not lock / unlock the trunk lid.

See Diagnostic trouble code (DTC) information

Condition

If rear electronic module registers signal too high on relay coil ground circuit when locking, diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Faulty relay (short circuit in relay coil).
2. Defective control unit.

Fault symptom[s]

1. Tank hatch will not open/lock.

See Diagnostic trouble code information

See Diagnostic trouble code information

Condition

If the rear electronic module registers no signal/signal too low on relay coil ground circuit diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Oxidation of relay socket contacts.
2. Relay is loose or missing.
3. Faulty relay (open circuit/short circuit to ground in relay coil).
4. Defective control unit.

Fault symptom[s]

1. Tank hatch will not open/lock.

See Diagnostic trouble code information

See Diagnostic trouble code information

Condition

If rear electronic module registers signal too high on relay coil ground circuit when unlocking, diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Faulty relay (short circuit in relay coil).
2. Defective control unit.

Fault symptom[s]

1. Tank hatch will not open/lock.

See Diagnostic trouble code information

Condition

If the rear electronic module registers no signal/signal too low on relay coil ground circuit diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Oxidation of relay socket contacts.
2. Relay is loose or missing.
3. Faulty relay (open circuit/short circuit to ground in relay coil).
4. Defective control unit.

Fault symptom[s]

1. Tank hatch will not open/lock.

See Diagnostic trouble code information

Diagnostic trouble code (DTC) informationREM-7A20

Condition

The Rear electronic module (REM) checks the voltage supply to the Subwoofer module (SUB) via a driver stage.

The diagnostic trouble code (DTC) is stored if the control module detects that the output has a short-circuit to supply voltage or if the driver stage has a too high a temperature.

The diagnostic trouble code (DTC) can be diagnosed in ignition positions I or II.

Scheme 1849

Substitute Value

1. The control module deactivates the output.
2. If the fault has been detected in 100 ignition cycles, the output is closed permanently until the diagnostic trouble code is erased (applies from structure week 200539).

Possible Source

1. Short-circuit to supply voltage in the signal cable.
2. Internal fault in Rear electronic module (REM).

Fault symptom[s]

1. Subwoofer sound reproduction. Doesn't correspond to set position.
2. No sound from subwoofer

Diagnostic trouble code (DTC) information REM-8B01

Condition

The rear electronic module (REM) powers the right-hand parking lamp directly via an output.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) registers that the signal at the output is too low.

The diagnostic trouble code (DTC) can be diagnosed at key position II.

Substitute Value

1. If the fault has been detected in 100 ignition cycles, the output is closed permanently until the diagnostic trouble code is erased (applies from structure week 200539).

Possible Source

1. Short-circuit to ground in the signal cable.

Fault symptom[s]

1. The parking lamps do not operate.

Scheme 1850

1. Ignition off
2. Disconnect connector D on the rear electronic module (REM). Check the signal cable. Check for a short-circuit to ground. For the V70 Take readings between: Rear electronic module (REM) terminal #D5 (#5) and terminal #A1 on the connector for the rear left-hand lamp housing Terminal #A1 on the connector for the rear left-hand lamp housing and terminal #A5 on the connector for the rear right-hand lamp housing. Other information See «Connecting the breakout box»(ref-430921-S40351701642011101900000) See «Signal specification»(ref-430923-S36978396402011101900000) See «Contents»(ref-430909-S26456997912011101900000)

1. Continue Refer to «Verification»(ref-431020-S10825151322011101900000)

Diagnostic trouble code (DTC) information REM-8B11

Condition

The rear electronic module (REM) powers the left-hand parking lamp directly via an output.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) registers that the signal at the output is too low.

The diagnostic trouble code (DTC) can be diagnosed at key position II.

Substitute Value

1. If the fault has been detected in 100 ignition cycles, the output is closed permanently until the diagnostic trouble code is erased (applies from structure week 200539).

Possible Source

1. Short-circuit to ground in the signal cable.

Fault symptom[s]

1. The parking lamps do not operate.

Diagnostic trouble code (DTC) information REM-8B21

Condition

Scheme 1851

The rear electronic module (REM) powers the license plate lighting directly via an output.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) detects a faulty signal.

The diagnostic trouble code (DTC) can be diagnosed at key position II.

Substitute Value

1. If the fault has been detected in 100 ignition cycles, the output is closed permanently until the diagnostic trouble code is erased (applies from structure week 200539).

Possible Source

1. Short-circuit to ground in the signal cable.

Fault symptom[s]

1. The license plate lighting does not operate.

Diagnostic trouble code (DTC) information REM-8C21

Condition

Scheme 1852

The rear electronic module (REM) powers the rear fog lamps directly via an output.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) detects a faulty signal.

The diagnostic trouble code (DTC) can be diagnosed at key position II.

Substitute Value

1. If the fault has been detected in 100 ignition cycles, the output is closed permanently until the diagnostic trouble code is erased (applies from structure week 200539).

Possible Source

1. Short-circuit to ground in the signal cable.

Fault symptom[s]

1. The rear fog lamp does not work.

Condition

If control unit registers signal too high from status flag when activating relay control, the diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Relay control to relay 2/49 short circuited to battery voltage.

Fault symptom[s]

1. Rear fog lamp does not work.

See Diagnostic trouble code information

Condition

If control unit registers an open circuit from the status flag when relay control is not activated, the diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Open circuit in relay control to relay 2/49. Relay 2/49 not installed.

Fault symptom[s]

1. Rear fog lamp does not work.

See Diagnostic trouble code information

Diagnostic trouble code (DTC) information REM-8D11

Condition

Scheme 1853

The rear electronic module (REM) powers the high level stop lamps directly via an output.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) registers that the signal at the output is too low.

The diagnostic trouble code (DTC) can be diagnosed at key position II.

Substitute Value

1. None.

Possible Source

1. Short-circuit to ground in the signal cable.

Fault symptom[s]

1. The stop lamp does not light when the brake pedal is depressed.

Condition

Diagnostic trouble code (DTC) REM-8D11 is stored if the rear electrical module (REM) registers that the signal for the high mounted stop lamp is too high, too low or missing.

Note. The diagnostic trouble code (DTC) may be stored if the incorrect roof spoiler is installed. Do not replace the spoiler if the stop lamp is working.

Substitute Value

None.

Possible Source

1. Short-circuit or open-circuit in the wiring for the high mounted stop lamp
2. Defective stop lamp
3. Incorrect roof spoiler installed.

Fault symptom[s]

1. The stop lamp does not light when the brake pedal is depressed.

Condition

Diagnostic trouble code (DTC) REM-8D11 is stored if the rear electrical module (REM) registers that the signal for the high mounted stop lamp is too high, too low or missing.

Substitute Value

None.

Possible Source

1. Short-circuit or open-circuit in the wiring for the high mounted stop lamp
2. Defective stop lamp.

Fault symptom[s]

1. The stop lamp does not light when the brake pedal is depressed.

Diagnostic trouble code (DTC) information REM-8D12

Condition

The rear electronic module (REM) powers the high level stop lamps directly via an output.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) registers that the signal at the output is too high.

The diagnostic trouble code (DTC) can be diagnosed at key position II.

Substitute Value

1. None.

Possible Source

1. Short-circuit to supply voltage in the signal cable
2. High brake light not installed/damaged.

Fault symptom[s]

1. The stop lamp lights constantly.
2. Message in display

Condition

If control unit registers signal too high from status flag when activating relay control, the diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Relay control to relay 2/80 short circuited to battery voltage.

Fault symptom[s]

1. Reversing light not working.

See Diagnostic trouble code information

Condition

If control unit registers an open circuit from the status flag when relay control is not activated, the diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Open circuit in relay control to relay 2/80.

Fault symptom[s]

1. Reversing light not working.

See Diagnostic trouble code information

Condition

The rear electronic module checks the signal from the Xenon lamp position sensor.

Diagnostic trouble code (DTC) REM-8F10 is stored in the rear electrical module if the rear electrical module registers too high a signal from the Xenon lamp position sensor.

Diagnostic trouble code (DTC) REM-8F10 can be detected at ignition on.

Substitute Value

1. None.

Possible Source

1. Short-circuit to supply voltage in the signal cable
2. The position sensor for the Xenon lamp is incorrectly installed.

Fault symptom[s]

1. The road surface is not illuminated.

Diagnostic trouble code (DTC) information REM-8F10

Condition

Scheme 1854

The rear electronic module (REM) checks the signal from the rear position sensor.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) registers a faulty signal from the position sensor.

The diagnostic trouble code (DTC) can be diagnosed at key position II.

Substitute Value

1. The shortest headlamp range will be used.

Possible Source

1. Short-circuit to supply voltage in the signal cable
2. Defective position sensor.

Fault symptom[s]

1. Automatic headlamp range control is not functioning.

Condition

The rear electronic module checks the signal from the Xenon lamp position sensor.

Diagnostic trouble code (DTC) REM-8F11 is stored in the rear electrical module if the rear electrical module registers too high a signal from the Xenon lamp position sensor.

Diagnostic trouble code (DTC) REM-8F11 can be detected at ignition on.

Substitute Value

1. None.

Possible Source

1. Short-circuit to ground in the signal cable
2. Open-circuit in the signal cable
3. The position sensor for the Xenon lamp is incorrectly installed.

Fault symptom[s]

1. The road surface is not illuminated.

Diagnostic trouble code (DTC) information REM-8F11

Condition

The rear electronic module (REM) checks the signal from the rear position sensor.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) registers that the signal from the position sensor is too low.

The diagnostic trouble code (DTC) can be diagnosed at key position II.

Substitute Value

1. The shortest headlamp range will be used.

Possible Source

1. Short-circuit to ground in the signal cable
2. The position sensor is not installed.

Fault symptom[s]

1. Automatic headlamp range control is not functioning.

Condition

The rear electrical module checks if the position sensor for the xenon lamp is calibrated.

Diagnostic trouble code (DTC)REM-8F12 is stored in the rear electrical module if the rear electrical module registers that the Xenon lamp position sensor is not calibrated.

Diagnostic trouble code (DTC) REM-8F12 can be detected at ignition on.

Substitute Value

1. None.

Possible Source

1. Calibration sequence not carried out.

Fault symptom[s]

1. The road surface is not illuminated.

Diagnostic trouble code (DTC) information REM-8F12

Condition

The rear electronic module (REM) checks the signal from the rear position sensor.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) registers that the position sensor is not calibrated.

The diagnostic trouble code (DTC) can be diagnosed at key position II.

Substitute Value

1. The shortest headlamp range will be used.

Possible Source

1. The position sensor is not calibrated.

Fault symptom[s]

1. Automatic headlamp range control is not functioning.

Diagnostic trouble code (DTC) information REM-8F13

Condition

The rear electrical module checks if the position sensor for the xenon lamp has been correctly calibrated.

Diagnostic trouble code (DTC) REM-8F13 is stored if the rear electronic module (REM) registers that the position sensor for the xenon lamp has not been correctly calibrated.

Diagnostic trouble code (DTC) REM-8F13 can be detected after calibration has been carried out.

Substitute Value

None.

Possible Source

1. The position sensor for the Xenon lamp is incorrectly installed
2. The calibration has been run with the vehicle under load or on an uneven surface.

Fault symptom[s]

1. The road surface is not illuminated.

Condition

The rear electronic module (REM) checks the signal from the rear position sensor.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) registers that the calibration of the position sensor failed.

The diagnostic trouble code (DTC) can be diagnosed at key position II.

Substitute Value

1. The shortest headlamp range will be used.

Possible Source

1. The calibration of the position sensor failed.

Fault symptom[s]

1. Automatic headlamp range control is not functioning.

Condition

Diagnostic trouble code (DTC) REM-8F41 is stored if the signal across the relay coil (2/16) is too high when the tailgate wiper is activated.

The fuse can blow if relays are activated in the wrong order. This can happen when the key is turned from position I to position II and the wiper arm is activated at the same time.

Substitute Value

None.

Possible Source

1. Damaged tailgate wiper fuse.
2. Damaged relay (short-circuit in the relay coil).

Fault symptom[s]

1. The rear windscreen wiper motor does not operate.

See Diagnostic trouble code information

Condition

Diagnostic trouble code (DTC) REM-8F43 is generated if the signal across relay coil (2/16) is missing or too low when the tailgate wiper relay is activated.

The fuse can blow if relays are activated in the wrong order. This can happen when the key is turned from position I to position II and the wiper arm is activated at the same time.

Substitute Value

None.

Possible Source

1. Damaged fuse in the tailgate wiper.
2. Oxidation in the relay base switches.
3. Relay is not fit.

Fault symptom[s]

1. The rear windscreen wiper motor does not operate.

See Diagnostic trouble code information

Condition

If control unit registers signal too high from status flag when activating relay control, the diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Relay control to relay 2/82 short circuited to battery voltage.

Fault symptom[s]

1. Rear window heating does not work.

See Diagnostic trouble code information

Condition

If control unit registers an open circuit from the status flag when relay control is not activated, the diagnostic trouble code is displayed.

Substitute Value

Nothing.

Possible Source

1. Open circuit in relay control to relay 2/82. Relay 2/82 not installed.

Fault symptom[s]

1. Heated rear window does not work.

See Diagnostic trouble code information

Diagnostic trouble code (DTC) information REM-9F21

Condition

The rear electronic module (REM) powers the cargo compartment lighting directly via an output.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) registers that the signal at the output is too low.

The diagnostic trouble code (DTC) can be diagnosed at key position II.

Substitute Value

1. If the fault has been detected in 100 ignition cycles, the output is closed permanently until the diagnostic trouble code is erased (applies from structure week 200539).

Possible Source

1. Short-circuit to ground in the signal cable.

Fault symptom[s]

1. The cargo compartment lighting does not function.

Diagnostic trouble code (DTC) information REM-DD00

Condition

The rear electronic module (REM) transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The diagnostic trouble code (DTC) is stored if the control module registers serious interference (LIN communication blocked) with the parking assistance module (PAM).

The diagnostic trouble code (DTC) can be detected when the ignition is in position II for at least 10 seconds and the battery voltage is > 10.5 volts.

Note! In the event of REM-DDxx diagnostic trouble codes (DTCs), the rear electronic module (REM) must not be replaced as the diagnostic trouble code (DTC) indicates a short-circuit in one or more conductors in the LIN network! The rear electronic module (REM) is the only control module that monitors the voltage level in the LIN wiring. The rear electronic module (REM) is therefore the only control module that can store a diagnostic trouble code (DTC) for a short-circuit to ground or supply voltage in one of the cables. Do not replace the rear electronic module (REM) in the event of a LIN fault unless VIDA fault-tracing has indicated that the rear electronic module (REM) has an internal fault.

Substitute Value

1. None.

Possible Source

1. Short-circuit between signal cables
2. Open-circuit in one of the signal cables
3. Internal fault in another control module in the same part of the network.

Fault symptom[s]

1. The parking assistance system does not operate.

Diagnostic trouble code (DTC) information REM-DD01

Condition

The rear electronic module (REM) transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The diagnostic trouble code (DTC) is stored if the control module registers serious interference (LIN communication blocked) with the parking assistance module (PAM).

The diagnostic trouble code (DTC) can be detected when the ignition is in position II for at least 10 seconds and the battery voltage is > 10.5 volts.

Note! In the event of REM-DDxx diagnostic trouble codes (DTCs), the rear electronic module (REM) must not be replaced as the diagnostic trouble code (DTC) indicates a short-circuit in one or more conductors in the LIN network! The rear electronic module (REM) is the only control module that monitors the voltage level in the LIN wiring. The rear electronic module (REM) is therefore the only control module that can store a diagnostic trouble code (DTC) for a short-circuit to ground or supply voltage in one of the cables. Do not replace the rear electronic module (REM) in the event of a LIN fault unless VIDA fault-tracing has indicated that the rear electronic module (REM) has an internal fault.

Substitute Value

1. None.

Possible Source

1. Short-circuit between signal cables
2. Open-circuit in one of the signal cables
3. Internal fault in another control module in the same part of the network.

Fault symptom[s]

1. The parking assistance system does not operate.

Diagnostic trouble code (DTC) information REM-DD02

Condition

The rear electronic module (REM) transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The diagnostic trouble code (DTC) is stored if the control module registers serious interference (LIN communication blocked) with the parking assistance module (PAM).

The diagnostic trouble code (DTC) can be detected when the ignition is in position II for at least 10 seconds and the battery voltage is > 10.5 volts.

Note! In the event of REM-DDxx diagnostic trouble codes (DTCs), the rear electronic module (REM) must not be replaced as the diagnostic trouble code (DTC) indicates a short-circuit in one or more conductors in the LIN network! The rear electronic module (REM) is the only control module that monitors the voltage level in the LIN wiring. The rear electronic module (REM) is therefore the only control module that can store a diagnostic trouble code (DTC) for a short-circuit to ground or supply voltage in one of the cables. Do not replace the rear electronic module (REM) in the event of a LIN fault unless VIDA fault-tracing has indicated that the rear electronic module (REM) has an internal fault.

Substitute Value

1. None.

Possible Source

1. Short-circuit between signal cables
2. Open-circuit in one of the signal cables
3. Internal fault in another control module in the same part of the network.

Fault symptom[s]

1. The parking assistance system does not operate.

Diagnostic trouble code (DTC) information REM-DD10

Condition

The rear electronic module (REM) transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The diagnostic trouble code (DTC) is stored if the control module registers serious interference (LIN communication blocked) with the parking assistance module (PAM).

The diagnostic trouble code (DTC) can be detected when the ignition is in position II for at least 10 seconds and the battery voltage is > 10.5 volts.

Note! In the event of REM-DDxx diagnostic trouble codes (DTCs), the rear electronic module (REM) must not be replaced as the diagnostic trouble code (DTC) indicates a short-circuit in one or more conductors in the LIN network! The rear electronic module (REM) is the only control module that monitors the voltage level in the LIN wiring. The rear electronic module (REM) is therefore the only control module that can store a diagnostic trouble code (DTC) for a short-circuit to ground or supply voltage in one of the cables. Do not replace the rear electronic module (REM) in the event of a LIN fault unless VIDA fault-tracing has indicated that the rear electronic module (REM) has an internal fault.

Substitute Value

1. None.

Possible Source

1. Short-circuit between signal cables
2. Open-circuit in one of the signal cables
3. Internal fault in another control module in the same part of the network.

Fault symptom[s]

1. The parking assistance system does not operate.

Diagnostic trouble code (DTC) information REM-DD20

Condition

The rear electronic module (REM) transmits and receives information via a standardized serial communication method - Volcano Lite (VOLVO CAN based distributed real time Operative environment). The diagnostic trouble code (DTC) is stored if the control module registers serious interference (communication blocked) with the inclination sensor module (ISM).

The diagnostic trouble code (DTC) can be detected when the ignition is in position II for at least 10 seconds and the battery voltage is > 10.5 volts.

Note! In the event of CEM-DDxx diagnostic trouble codes (DTCs), the rear electronic module (REM) must not be replaced as the diagnostic trouble code (DTC) indicates a short-circuit in one or more conductors! The rear electronic module (REM) is the only control module that monitors the voltage level in the signal wiring. The rear electronic module (REM) is therefore the only control module that can store a diagnostic trouble code (DTC) for a short-circuit to ground or supply voltage in one of the cables. Do not replace the rear electronic module (REM) in the event of this type of fault unless VIDA fault-tracing has indicated that the rear electronic module (REM) has an internal fault.

Substitute Value

1. None.

Possible Source

1. Short-circuit between signal cables
2. Open-circuit in one of the signal cables
3. Internal fault in another control module in the same part of the network.

Fault symptom[s]

1. False alarm.

Diagnostic trouble code (DTC) information REM-DD21

Condition

The rear electronic module (REM) transmits and receives information via a standardized serial communication method - Volcano Lite (VOLVO CAN based distributed real time Operative environment). The diagnostic trouble code (DTC) is stored if the control module registers serious interference (communication blocked) with the inclination sensor module (ISM).

The diagnostic trouble code (DTC) can be detected when the ignition is in position II for at least 10 seconds and the battery voltage is > 10.5 volts.

Note! In the event of CEM-DDxx diagnostic trouble codes (DTCs), the rear electronic module (REM) must not be replaced as the diagnostic trouble code (DTC) indicates a short-circuit in one or more conductors! The rear electronic module (REM) is the only control module that monitors the voltage level in the signal wiring. The rear electronic module (REM) is therefore the only control module that can store a diagnostic trouble code (DTC) for a short-circuit to ground or supply voltage in one of the cables. Do not replace the rear electronic module (REM) in the event of this type of fault unless VIDA fault-tracing has indicated that the rear electronic module (REM) has an internal fault.

Substitute Value

1. None.

Possible Source

1. Short-circuit between signal cables
2. Open-circuit in one of the signal cables
3. Internal fault in another control module in the same part of the network.

Fault symptom[s]

1. False alarm.

Diagnostic trouble code (DTC) information REM-E001

Condition

The control modules transmit and receive information via a standardized serial communication method - CAN (Control Area Network). The diagnostic trouble code (DTC) is stored if the control module registers serious interference (CAN communication blocked).

Note. In the event of system communication problems, it is not possible to communicate with the control module. Therefore it will only be possible to read off the diagnostic trouble code (DTC) if the fault is intermittent.

Substitute Value

1. The control module shuts itself off ("bus-off"). HINT: The control module will remain shut off until the power supply is broken (15, 30, X). When the power supply is connected the control module will make a new attempt to communicate.

Possible Source

1. Short-circuit between the control area network (CAN) wiring
2. Open-circuit in the control area network (CAN) wiring
3. Internal fault in the control module
4. Internal fault in another control module in the same part of the control area network (CAN).

Fault symptom[s]

1. The central locking system does not function at all
2. The fuel gauge indicates zero even though there is fuel in the tank.
3. Rear demist does not operate.
4. Retractable headrest not operating.
5. Does not lock / unlock the fuel tank filler cap.
6. The power window mechanism in the rear door does not operate.
7. The tail lamps are not working.

Condition

Scheme 1855

The control modules transmit and receive information via a standardized serial communication method - CAN (Controller Area Network). The diagnostic trouble code (DTC) is stored if the control module registers serious interference (CAN communication blocked).

Note. In the event of system communication problems, it is not possible to communicate with the control module. Therefore it will only be possible to read off the fault if it is intermittent.

Substitute Value

1. The control module shuts itself off ("bus-off"). HINT: The control module will remain shut off until the power supply is broken (15, 30, X). When the power supply is connected the control module will make a new attempt to communicate.

Possible Source

1. Short-circuit between the control area network (CAN) wiring
2. Open-circuit in the control area network (CAN) wiring
3. Internal fault in the control module
4. Internal fault in another control module in the same part of the control area network (CAN).

Fault symptom[s]

1. The fuel gauge indicates zero even though there is fuel in the tank
2. Rear demist does not operate
3. Retractable headrest not operating
4. No locking/unlocking of rear doors
5. No locking or unlocking of the tailgate or trunk lid (V70/XC70/XC90)
6. Does not lock / unlock the fuel tank filler cap
7. The power window mechanism in the rear door does not operate.

Diagnostic trouble code (DTC) information REM-E003

Condition

The control module compares its configuration ID with the signal configuration transmitted on the control area network (CAN) by the central electronic module (CEM). If the configuration IDs do not correspond the fault code is stored. The diagnostic trouble code (DTC) is also stored if the communication between the control module and the central electronic module (CEM) is interrupted.

Note. In the event of open-circuit in both the control area network (CAN) cables, it is not possible to communicate with the control module. Therefore it will only be possible to read off the diagnostic trouble code (DTC) if this type of fault is intermittent. When the diagnostic trouble code (DTC) is stored, the control module responds to the diagnostic command, however normal control area network (CAN) communication does not work. ("Expulsion mode")

Substitute Value

1. None.

Possible Source

1. Faulty control area network (CAN) configuration ID. (The node is not intended for this car, for example a used control module with different software/hardware.)
2. Open-circuit in the control area network (CAN) wiring between the control module and the central electrical module (CEM).

Fault symptom[s]

1. The fuel gauge indicates zero even though there is fuel in the tank
2. Rear demist does not operate
3. Retractable headrest not operating
4. No locking/unlocking of rear doors
5. No locking or unlocking of the tailgate or trunk lid (V70/XC70/XC90)
6. Does not lock / unlock the fuel tank filler cap
7. The power window mechanism in the rear door does not operate.

Condition

The control module compares its configuration ID with the signal configuration transmitted on the control area network (CAN) by the central electronic module (CEM). If the configuration IDs do not correspond the fault code is stored. The diagnostic trouble code (DTC) is also stored if the communication between the control module and the central electronic module (CEM) is or has been interrupted.

Note. In the event of an open-circuit in both the control area network (CAN) cables, it is not possible to communicate with the control module. Therefore it will only be possible to read off the diagnostic trouble code (DTC) if this type of fault is intermittent. When the diagnostic trouble code (DTC) is stored, the control module responds to the diagnostic command, however normal control area network (CAN) communication does not work. ("Expulsion mode")

Substitute Value

1. None.

Possible Source

1. Incorrect control area network (CAN) configuration ID (the node is not intended for this car - for example a used control module with different software/hardware)
2. Open-circuit in the control area network (CAN) wiring between the control module and the central electrical module (CEM).

Fault symptom[s]

1. The central locking system does not function at all.
2. The fuel gauge indicates zero even though there is fuel in the tank.
3. Rear demist does not operate.
4. Retractable headrest not operating.
5. Does not lock / unlock the fuel tank filler cap.
6. The power window mechanism in the rear door does not operate.
7. The tail lamps are not working.

Diagnostic trouble code (DTC) information REM-E010

Condition

Scheme 1856

The rear electronic module (REM) compares its supply voltage with the information about the supply voltage to the central electronic module (CEM) transmitted on the CAN network.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) registers that its own power supply is more than 3V below the power supply to the central electronic module (CEM).

The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value

1. None.

Possible Source

1. Half-burned fuse for the rear electronic module (REM)
2. Damaged power supply cable to the rear electronic module (REM)
3. Loose connections in the ground lead for the rear electronic module (REM)
4. Contact resistance or oxidation in the terminals.

Fault symptom[s]

1. The central locking system does not function at all.
2. The fuel gauge indicates zero even though there is fuel in the tank.
3. Rear demist does not operate.
4. Retractable headrest not operating.
5. Does not lock / unlock the fuel tank filler cap.
6. The power window mechanism in the rear door does not operate.
7. The tail lamps are not working.

Scheme 1857

Scheme 1858

1. Ignition on
2. Read off the power supply for the rear electronic module (REM) and the central electronic module (CEM). The voltage for the rear electronic module (REM) and the central electronic module (CEM) must be approximately the same. The fault is permanent if the voltage for the rear electronic module (REM) deviates by more than 3 V from the central electronic module (CEM). If the voltage is approximately the same, this indicates an intermittent fault, i. e. the fault was present previously but is not active at the moment.

1. Continue Refer to «Checking cable and component»(ref-431020-S37339632172011101900000)

Reading off diagnostic trouble codes (DTCs)

1. Ignition on. Read off the diagnostic trouble code (DTC) that is stored in the car. Make a note of the code. Report the code to VIDA customer support.

Diagnostic trouble code (DTC) information UEM-0004

Condition

Scheme 1859

The upper electronic module (UEM) receives information from the siren

If the alarm does not respond to repeated requests from the upper electronic module (UEM), the control module interprets it as a communication fault and the diagnostic trouble code (DTC) is stored.

The diagnostic trouble code (DTC) can be detected 40 seconds after the control module has been initialized.

Substitute Value

1. None.

Possible Source

1. Open-circuit in UEM_K3 (the serial cable between the upper electronic module (UEM), siren and sun roof)
2. Short-circuit to ground in UEM_K3
3. Short-circuit to supply voltage in UEM_K3
4. Defective siren.

Fault symptom[s]

1. Alarm/Arming does not work/No visible indication
2. Alarm/Alarm will not set off/No visible and/or audible signal
3. Text window and warning symbol/Text message

Condition

If control module receives no response from siren at repeated requests, this is understood as a communication fault and the diagnostic trouble code (DTC) is stored.

Substitute Value

1. None.

Possible Source

1. Open-circuit on UEM_K3 (serial cable between UEM, siren and sun roof).

1. UEM_K3 short-circuit to ground.

1. UEM_K3 short-circuit to battery voltage.

1. Defect siren.

Fault symptom[s]

1. Siren does not work.
2. Alarm does not work.

Diagnostic trouble code (DTC) information UEM-0005

Condition

Scheme 1860

The upper electronic module (UEM) receives information from the sun roof.

If the sun roof does not respond to repeated requests from the upper electronic module (UEM), the control module interprets it as a communication fault and the diagnostic trouble code (DTC) is stored.

The diagnostic trouble code (DTC) can be detected 20 seconds after the control module has been initialized.

Substitute Value

1. None.

Possible Source

1. Open-circuit in UEM_K3 (the serial cable between the upper electronic module (UEM), siren and sun roof)
2. Short-circuit to ground in UEM_K3
3. Short-circuit to supply voltage in UEM_K3
4. Damaged Sun roof module (SRM).

Fault symptom[s]

1. The power sun roof does not operate.

Condition

If the control unit does not get a response from the sunroof after a repeated request, the control unit interprets this as a communication fault and a diagnostic trouble code is set.

Substitute Value

1. Nothing.

Possible Source

1. Open circuit on UEM_K3 (serial wire between UEM, siren and sunroof).
2. UEM_K3 short circuited to ground.
3. UEM_K3 short circuited to voltage supply.
4. Defective sunroof.

Fault symptom[s]

1. Electric sunroof does not work.

Condition

If the control unit registers signal too low from the rear right reading lamp, the diagnostic trouble code is displayed.

Substitute Value

1. Nothing.

Possible Source

1. The switch for the rear right reading lamp has stuck down
2. The signal wire for the rear right reading lamp is short circuited to ground.

Fault symptom[s]

1. Courtesy lighting does not work.

Condition

If the control unit registers signal too low from the rear left reading lamp, the diagnostic trouble code is displayed.

Substitute Value

1. Nothing.

Possible Source

1. The switch for the rear left reading lamp has stuck down
2. The signal wire for the rear left reading lamp is short circuited to ground.

Fault symptom[s]

1. Courtesy lighting does not work.

Condition

If the upper electronic module registers that there is no signal on the mass movement sensor supply wire when the alarm is switched off and ignition in position l or ll, diagnostic trouble code UEM-000A is displayed.

Substitute Value

1. Nothing.

Possible Source

1. A faulty contact at sensor side and/or at control unit side.
2. Open circuit on level sensor voltage supply.
3. Faulty sensor.

Fault symptom[s]

1. No alarm from sensor.

Condition

If the upper electronic module registers too low a signal for the mass movement sensor supply wire when the alarm is set, diagnostic trouble code UEM-000B is displayed.

Substitute Value

1. Nothing.

Possible Source

1. Sensor power supply short circuited to ground
2. Faulty sensor.

Fault symptom[s]

1. No alarm from sensor.

Condition

Diagnostic trouble code (DTC) UEM-000C is stored if the upper electronic module registers that the signal in the movement sensor power cable is high when the alarm is deactivated and the ignition is off.

Substitute Value

1. None.

Possible Source

1. Short-circuit to supply voltage in the power supply cable to the sensor.

Fault symptom[s]

1. Does not alarm the sensor.

Condition

Diagnostic trouble code (DTC) UEM-0011 is stored if the upper electronic module registers that the signal in the movement sensor communication cable is low when the alarm is deactivated.

Substitute Value

1. None.

Possible Source

1. Short-circuit to ground in the sensor communication cable.
2. Defective sensor.

Fault symptom[s]

1. Does not alarm the sensor.

Diagnostic trouble code (DTC) information UEM-0013

Condition

Diagnostic trouble code (DTC) UEM-0013 is stored if diagnostic trouble codes (DTCs) UEM-000A, UEM-000B, UEM-000C, UEM-0011 and UEM-0012 are not stored and the upper electronic module (UEM) registers an internal fault in the movement sensor or registers that there is an open-circuit or high signal in the movement sensor communication cable when the alarm is active.

Diagnostic trouble code (DTC) UEM-0013 can be diagnosed when the car is locked from the outside using the remote control.

Substitute Value

1. None.

Possible Source

1. Contact fault on the sensor and/or control module sides
2. Open-circuit in the sensor communication cable
3. Short-circuit to supply voltage in the sensor communication cable
4. Defective sensor.

Fault symptom[s]

1. Does not alarm the sensor.

Condition

If the control unit detects that the general courtesy lighting switch has been pressed down for more than 3 minutes, a diagnostic trouble code is displayed. The test is done when the ignition is on or off.

Substitute Value

1. Nothing.

Possible Source

1. The general courtesy lighting switch has stuck
2. CFL (front left reading lamp switch signal) and CFR (front right reading lamp switch signal) short circuited to voltage supply.

Fault symptom[s]

1. Courtesy lighting does not work.

Condition

If the control unit registers a faulty signal from the front left reading lamp, the diagnostic trouble code is displayed.

Substitute Value

1. Nothing.

Possible Source

1. The switch for the front left reading lamp has stuck down
2. The signal wire for the front left reading lamp is short circuited to voltage supply.

Fault symptom[s]

1. Courtesy lighting does not work.

Condition

If the control unit registers a faulty signal from the right front reading lamp, the diagnostic trouble code is displayed.

Substitute Value

1. Nothing.

Possible Source

1. The switch for the front right reading lamp has stuck down
2. The signal wire for the front right reading lamp is short circuited to voltage supply.

Fault symptom[s]

1. Courtesy lighting does not work.

Condition

If the vehicle configuration data does not match the remote receiver configuration data and/or if there is an internal electrical fault in the rear view mirror, the diagnostic trouble code is displayed.

Substitute Value

1. Nothing.

Possible Source

1. Faulty frequency on remote receiver
2. Voltage fault between RKE and upper electronic module (UEM).

Fault symptom[s]

1. Cannot be operated using remote control
2. Cannot be activated/deactivated.

Condition

Diagnostic trouble code (DTC) UEM-0020 is stored if the control module registers that the actual value for rear view mirror anti-dazzle is different from the desired value.

Substitute Value

1. None.

Possible Source

1. Defective circuit in the rear view mirror.

Fault symptom[s]

1. No anti-dazzle function
2. Poor anti-dazzle function.

Symptom verification

HINT: After the repair it is necessary to check that the fault has been rectified.

1. Ignition off.
2. Connect the connectors, install the components, etc.
3. Ignition on. Shine a strong light on the inner rear-view mirror and check that it dims (becomes darker). Remove the light and check that the mirror lightens. The mirror should also lighten when reverse is engaged.

Does the rear view mirror dimmer work?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-431020-S36535911782011101900000)

Condition

If the control unit detects that the rear left reading lamp is on when the front left reading lamp is off, a faulty control signal from the lamp circuit displays the diagnostic trouble code.

Substitute Value

1. The lamp goes off.

Possible Source

1. The signal wire for the rear left reading lamp is short circuited to ground
2. Intermittent open circuit on signal wire.

Fault symptom[s]

1. Courtesy lighting does not work.

Condition

If the control unit detects that the rear left reading lamp is on when the front left reading lamp is off, a faulty control signal from the lamp circuit displays the diagnostic trouble code.

Substitute Value

1. The lamp goes off.

Possible Source

1. Open circuit in signal wire for rear left reading lamp. Short circuit to voltage supply on signal wire for rear left reading lamp.

Fault symptom[s]

1. Courtesy lighting does not work.

Condition

If the control unit detects that the rear right reading lamp is on when the front right reading lamp is off, a faulty control signal from the lamp circuit displays the diagnostic trouble code.

Substitute Value

1. The lamp goes off.

Possible Source

1. The signal wire for the rear right reading lamp is short circuited to ground
2. Intermittent open circuit on signal wire.

Fault symptom[s]

1. Courtesy lighting does not work.

Condition

If the control unit detects that the rear right reading lamp is on when the front right reading lamp is off, a faulty control signal from the lamp circuit displays the diagnostic trouble code.

Substitute Value

1. The lamp goes off.

Possible Source

1. Open circuit in signal wire for rear right reading lamp.
2. Short circuit to voltage supply on signal wire for rear right reading lamp.

Fault symptom[s]

1. Courtesy lighting does not work.

Condition

If the control unit detects that the front left reading lamp is on when the rear left reading lamp is off, a faulty control signal from the lamp circuit displays the diagnostic trouble code.

Substitute Value

1. The lamp goes off.

Possible Source

1. The signal wire for the front left reading lamp is short circuited to ground
2. Intermittent open circuit on signal wire.

Fault symptom[s]

1. Courtesy lighting does not work.

Condition

If the control unit detects that the front left reading lamp is on when the rear left reading lamp is off, a faulty control signal from the lamp circuit displays the diagnostic trouble code.

Substitute Value

1. The lamp goes off.

Possible Source

1. Faulty bulb.
2. Open circuit in signal wire for front left reading lamp.
3. Short circuit to voltage supply on signal wire for front left reading lamp.

Fault symptom[s]

1. Interior lighting does not work.

Condition

If the control unit detects that the front right reading lamp is on at the same time as the rear right reading lamp is off, a faulty control signal from the lamp circuit displays the diagnostic trouble code.

Substitute Value

1. The lamp goes off.

Possible Source

1. The signal wire for the front right reading lamp is short circuited to ground
2. Intermittent open circuit on signal wire.

Fault symptom[s]

1. Courtesy lighting does not work.

Condition

If the control unit detects that the front right reading lamp is on at the same time as the rear right reading lamp is off, a faulty control signal from the lamp circuit displays the diagnostic trouble code.

Substitute Value

1. The lamp goes off.

Possible Source

1. Open circuit in signal wire for front right reading lamp.
2. Short circuit to voltage supply on signal wire for front right reading lamp.

Fault symptom[s]

1. Courtesy lighting does not work.

Condition

If the control unit detects that the signal supply is off at the same time as the control signal for the general courtesy lighting is high, the diagnostic trouble code is displayed.

Substitute Value

1. The lamp goes off.

Possible Source

1. Open circuit or short circuit to ground on signal wire for general lighting.

Fault symptom[s]

1. Courtesy lighting does not work.

Diagnostic trouble code (DTC) information UEM-0038

Condition

Scheme 1861

The upper electronic module (UEM) checks the interior lighting. The diagnostic trouble code (DTC) is stored if the control module registers that there is an on signal for the interior lighting in the headlining when the control signal for the general lighting is low.

The diagnostic trouble code (DTC) can be diagnosed when the conditions are met for the interior lighting to be switched on at the same time as the lighting in the cargo compartment is off.

Substitute Value

1. The lamp goes out.

Possible Source

1. Short-circuit to ground in the signal cable for the general lighting.

Fault symptom[s]

1. The interior lighting does not work.

Condition

If the control unit registers a faulty control signal from the general courtesy lighting, the diagnostic trouble code is displayed.

Substitute Value

1. The lamp goes off.

Possible Source

1. Open circuit in signal wire for the general courtesy lighting.
2. Short circuit to voltage supply on signal wire for general lighting.

Fault symptom[s]

1. Courtesy lighting does not work.