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

Body Electrical 5 illustrations ~5669 words

Checking the wiring

Check the power supply cable between rear electronic module (REM) connector #B20 (#D20) and tilt sensor connector terminal #1. Check for an intermittent open-circuit.

Check the ground lead between the rear electronic module (REM), the ground terminal and tilt sensor connector terminal #5. Check for an intermittent open-circuit.

If no fault was found, try a new sensor.

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S19121820782011101900000)
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000)
  3. To access the rear electronic module (REM), see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-430924-S11839078312011101900000)
  4. To access and replace the tilt sensor, see «Tilt sensor alarm, replacing»(ref-431006-S30649679772011101900000)
  5. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .

Scheme 1862

Scheme 1862
Scheme 1862
  1. Continue Refer to «Information»(ref-431020-S26064442332011101900000)

Check the power supply cable between rear electronic module (REM) connector #B20 (#D20) and tilt sensor connector terminal #1. Check for an open-circuit.

Check the ground lead between rear electronic module (REM), ground terminal 31/72 and tilt sensor connector terminal #5. Check for an open-circuit.

In particular check the connector in the tilt sensor for contact resistance and oxidation.

If no fault was found, try a new sensor.

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S19121820782011101900000)
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000)
  3. To access the rear electronic module (REM), see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-430924-S11839078312011101900000)
  4. To access and replace the tilt sensor, see «Tilt sensor alarm, replacing»(ref-431006-S30649679772011101900000)
  5. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .
  1. Continue Refer to «Verification»(ref-431020-S34946594022011101900000)

Disconnect the connector from the lamp housing for the license plate lighting.

Check that the button has not stuck in the pressed in position. Check that there is not a short-circuit in the contact breaker for the switch: Take a reading between terminal #1 and ground.

Check the signal cable between rear electronic module connector terminal #B07 (#D7) and lamp housing connector terminal #1 for the license plate lighting for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S19121820782011101900000) .
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000) .
  3. To access the rear electronic module, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-451767-S28873772202012020900000) .
  4. To access and replace the license plate lighting, see «Bulb, number plate lighting, replacing»(ref-430927-S15597464422011101900000) .
  1. Continue Refer to «Information»(ref-431020-S32009489172011101900000)

Disconnect the connector from the lamp housing for the license plate lighting.

Check that the button has not stuck in the pressed in position. Check that there is not a short-circuit in the contact breaker for the switch: Take a reading between terminal #1 and ground.

Check the signal cable between rear electronic module connector terminal #B07 (terminal #D7) and lamp housing connector terminal #1 for the license plate lighting for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S19121820782011101900000) .
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000) .
  3. To access the rear electronic module, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-451767-S28873772202012020900000) .
  4. To access and replace the license plate lighting, see «Bulb, number plate lighting, replacing»(ref-430927-S15597464422011101900000) .
  1. Continue Refer to «Verification»(ref-431020-S35557492952011101900000)

Check the relay coil driver circuit for an intermittent short-circuit to supply voltage: Measure the voltage between terminal #2 in the relay base and relay 2/87.

For further information about a short-circuit to supply voltage, see Short-circuit to supply voltage, intermittent faults .

HINT: The voltage between terminal #2 and ground should be approximately 0 V.

Scheme 1863

Scheme 1863
Scheme 1863

If the voltmeter displays an incorrect value replace the control module.

Other information

  1. To access and replace the integrated relay / fusebox in the cargo compartment, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-430924-S11839078312011101900000) .
  1. Continue Refer to «Information»(ref-431020-S27011697942011101900000)
  1. Remove the relay. Check the relay coil driver circuit for a short-circuit to supply voltage by taking a voltmeter reading at terminal #2 in the relay base. For further information about a short-circuit to supply voltage, see «Short-circuit to supply voltage. Permanent faults»(ref-451698-S16880710822012020900000) . HINT: The voltage between terminal #2 and ground should be approximately 0 V. If the voltmeter displays an incorrect value replace the control module. Other information: To access and replace the integrated relay / fusebox in the cargo compartment, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-430924-S11839078312011101900000) .
  1. Continue Refer to «Verification»(ref-431020-S31186769322011101900000)
  1. Remove relay 2/87. Check the driver circuit for the relay coil for an intermittent open-circuit as follows: activate the relay driver. Measure the voltage between terminals #1 and #2 on the relay base. For further information about intermittent open-circuits, see «Open-circuit, intermittent faults»(ref-451698-S35656402062012020900000) . HINT: The voltage between terminals #1 and #2 should be battery voltage. HINT: If the value deviates excessively, check the voltage between terminal #2 and the battery and between terminal #1 and ground. Both should equal battery voltage. HINT: Check for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-451698-S35656402062012020900000) . HINT: Do not forget to check that the power supply to the control module is OK. Other information: To access the integrated relay / fusebox in the cargo compartment, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-451767-S28873772202012020900000) .

Was a fault detected?

  1. YES Refer to «Information»(ref-431020-S19422888022011101900000)
  2. NO Refer to «Checking the control module for short-circuits»(ref-431020-S13470856702011101900000)

Check the relay coil driver circuit for an intermittent short-circuit to supply voltage: Measure the voltage between terminal #2 in the relay base and relay 2/59.

For further information about a short-circuit to supply voltage, see Short-circuit to supply voltage, intermittent faults .

HINT: The voltage between terminal #2 and ground should be approximately 0 V.

Scheme 1864

Scheme 1864
Scheme 1864

If the voltmeter displays an incorrect value replace the control module.

Other information

  1. To access and replace the integrated relay / fusebox in the cargo compartment, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-430924-S11839078312011101900000) .
  1. Continue Refer to «Information»(ref-431020-S16078679102011101900000)
  1. Remove the relay. Check the relay coil driver circuit for a short-circuit to supply voltage by taking a voltmeter reading at terminal #2 in the relay base. For further information about a short-circuit to supply voltage, see «Short-circuit to supply voltage. Permanent faults»(ref-451698-S16880710822012020900000) . HINT: The voltage between terminal #2 and ground should be approximately 0 V. If the voltmeter displays an incorrect value replace the control module. Other information: To access and replace the integrated relay / fusebox in the cargo compartment, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-430924-S11839078312011101900000) .
  1. Continue Refer to «Verification»(ref-431020-S10247051882011101900000)
  1. Remove the relay. Check the relay coil driver circuit for a short-circuit to supply voltage by measuring the voltage at terminal #2 in the relay base. HINT: The voltage between terminal #2 and ground should be approximately 0 V. Replace the control module if the voltmeter displays an incorrect value. Other information: To access and replace the integrated relay / fusebox in the cargo compartment, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-430924-S11839078312011101900000) See «Checking wiring and terminals»(ref-430909-S05889726072011101900000)
  1. Continue Refer to «Verification»(ref-431020-S03277008822011101900000)
  1. Remove relay 2/59. Check the driver circuit for the relay coil for an intermittent open-circuit as follows: activate the relay driver. Measure the voltage between terminals #1 and #2 on the relay base. For further information about intermittent open-circuits, see «Open-circuit, intermittent faults»(ref-451698-S35656402062012020900000) . HINT: The voltage between terminals #1 and #2 should be battery voltage. HINT: If the value deviates excessively, check the voltage between terminal #2 and the battery and between terminal #1 and ground. Both should equal battery voltage. HINT: Check for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-451698-S35656402062012020900000) . HINT: Do not forget to check that the power supply to the control module is OK. Other information: To access the integrated relay / fusebox in the cargo compartment, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-451767-S28873772202012020900000) .

Was a fault detected?

  1. YES Refer to «Information»(ref-431020-S20253371082011101900000)
  2. NO Refer to «Checking the control module for short-circuits»(ref-431020-S11600165242011101900000)
  1. Remove relay. Check the driver circuit for the relay coil for an open-circuit as follows: Activate the relay driver. Measure the voltage between terminals #1 and #2 on the relay base. For further information about open-circuits, see «Open-circuit, permanent faults»(ref-451698-S19428997892012020900000) . HINT: The voltage between terminals #1 and #2 should be battery voltage. HINT: If the value deviates excessively, check the voltage between terminal #2 and the battery and between terminal #1 and ground. Both should equal battery voltage. HINT: Check for an open-circuit according to «Open-circuit, permanent faults»(ref-451698-S19428997892012020900000) . HINT: Do not forget to check that the power supply to the control module is OK. Other information: To access the integrated relay / fusebox in the cargo compartment, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-451767-S28873772202012020900000) .

Was a fault detected?

  1. YES Refer to «Verification»(ref-431020-S16165880892011101900000)
  2. NO Refer to «Checking the control module for short-circuits»(ref-431020-S38365700482011101900000)
  1. Remove relay Check the driver circuit for the relay coil for an open-circuit as follows: activate the relay driver. Measure the voltage between terminals #1 and #2 on the relay base. HINT: The voltage between terminals #1 and #2 should be battery voltage. HINT: If the value deviates excessively, check the voltage between terminal #2 and the battery voltage and between terminal #1 and ground. Both should equal battery voltage. HINT: Check for an open-circuit. HINT: Do not forget to check that the power supply to the control module is OK. Other information: To access the integrated relay / fusebox in the cargo compartment, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-430924-S11839078312011101900000) See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .

Was a fault detected?

  1. YES Refer to «Verification»(ref-431020-S20827990472011101900000)
  2. NO Refer to «Checking the control module for short-circuits»(ref-431020-S00601803472011101900000)

Check the relay coil driver circuit for an intermittent short-circuit to supply voltage: Measure the voltage between terminal #2 in the relay base and relay 2/58.

For further information about a short-circuit to supply voltage, see Short-circuit to supply voltage, intermittent faults .

HINT: The voltage between terminal #2 and ground should be approximately 0 V.

If the voltmeter displays an incorrect value replace the control module.

Other information

  1. To access and replace the integrated relay / fusebox in the cargo compartment, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-430924-S11839078312011101900000) .
  1. Continue Refer to «Information»(ref-431020-S22322312232011101900000)
  1. Remove relay 2/58. Check the driver circuit for the relay coil for an intermittent open-circuit as follows: activate the relay driver. Measure the voltage between terminals #1 and #2 on the relay base. For further information about intermittent open-circuits, see «Open-circuit, intermittent faults»(ref-451698-S35656402062012020900000) . HINT: The voltage between terminals #1 and #2 should be battery voltage. HINT: If the value deviates excessively, check the voltage between terminal #2 and the battery and between terminal #1 and ground. Both should equal battery voltage. HINT: Check for an intermittent open-circuit according to «Open-circuit, intermittent faults»(ref-451698-S35656402062012020900000) . HINT: Do not forget to check that the power supply to the control module is OK. Other information: To access the integrated relay / fusebox in the cargo compartment, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-451767-S28873772202012020900000) .

Was a fault detected?

  1. YES Refer to «Information»(ref-431020-S07482516052011101900000)
  2. NO Refer to «Checking the control module for short-circuits»(ref-431020-S03030367142011101900000)
  1. Remove relay 2/58. Check the driver circuit for the relay coil for an open-circuit as follows: Activate the relay driver. Measure the voltage between terminals #1 and #2 on the relay base. For further information about open-circuits, see «Open-circuit, permanent faults»(ref-451698-S19428997892012020900000) . HINT: The voltage between terminals #1 and #2 should be battery voltage. HINT: If the value deviates excessively, check the voltage between terminal #2 and the battery and between terminal #1 and ground. Both should equal battery voltage. HINT: Check for an open-circuit according to «Open-circuit, permanent faults»(ref-451698-S19428997892012020900000) . HINT: Do not forget to check that the power supply to the control module is OK. Other information: To access the integrated relay / fusebox in the cargo compartment, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-451767-S28873772202012020900000) .

Was a fault detected?

  1. YES Refer to «Verification»(ref-431020-S02514069462011101900000)
  2. NO Refer to «Checking the control module for short-circuits»(ref-431020-S16356207062011101900000)
  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 #D6 (#6) 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-S04775742352011101900000)
  1. Ignition off
  2. Disconnect connector F on the rear electronic module (REM). Check the signal cable. Check for a short-circuit to ground. For the V70 and XC90 Take readings between: Rear electronic module (REM) terminal #F10 (#50) and terminal #1 on the connector for the license plate lighting. Remedy as necessary. 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-S20136337962011101900000)
  1. Ignition off
  2. Disconnect connector B on the rear electronic module (REM). Check the signal cable. Check for a short-circuit to ground. For the V70, XC70 and XC90 Take readings between: Rear electronic module (REM) terminal #B4 (#4) and terminal #A3 on the connector for the rear left-hand lamp housing Terminal #A3 on the connector for the rear left-hand lamp housing and terminal #A3 on the connector for the rear right-hand lamp housing. Remedy as necessary. 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-S02748491902011101900000)

Checking the wiring and component

Check that the rear fog lamp relay (position 2/49) is correctly installed.

Check the relay terminal (2/49). Check for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults . Check for contact resistance and oxidation according to Contact resistance and oxidation . Check for loose connections according to Loose connections (terminals) .

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S19121820782011101900000) .
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000) .
  3. To access the control module, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-451767-S28873772202012020900000) .
  4. When the relay is installed and activated, the voltage at the relay guide (terminal #2) should be 0 V.

Scheme 1865

Scheme 1865
Scheme 1865
  1. Continue Refer to «Information»(ref-431020-S11421095342011101900000)

Check that the rear fog lamp relay (position 2/49) is correctly installed.

Check the relay terminal (2/49). Check for contact resistance and oxidation according to Contact resistance and oxidation . Check for loose connections according to Loose connections (terminals) .

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S19121820782011101900000) .
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000) .
  3. To access the rear electronic module, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-451767-S28873772202012020900000) .
  4. When the relay is installed and activated, the voltage at the relay guide (terminal #2) should be 0 V.
  1. Continue Refer to «Information»(ref-431020-S15422078752011101900000)
  1. Ignition off
  2. Disconnect connectors A and F on the rear electronic module (REM). Check the signal cable. Check for a short-circuit to ground. For the V70, XC70 and XC90 Take readings between: Rear electronic module (REM) terminal #F4 (#44) and terminal #1 on the connector for the high level stop lamp. Remedy as necessary. 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-S05198064502011101900000)

Checking components and wiring

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

Check the rear electronic module (REM) and the high-mounted stop lamp connectors. Check for contact resistance and oxidation. Check for loose connections. Check for damage carefully.

HINT: When the stop lamp is activated, the voltage between #1 and #5 in the connector for the stop lamp must be battery voltage.

Check the power supply cable between rear electronic module (REM) terminal #4D (#B04) and brake light connector terminal #1. Check for an open-circuit. Check for a short-circuit to ground.

Check the ground lead between brake light connector terminal #5 and the ground terminal. Check for an open-circuit. Check for a short-circuit to supply voltage.

Try a new brake light if no faults were found.

Remedy as necessary.

Other information

  1. To access / replace the high mounted stop lamp, see «Stop lamp, rear windshield, replacing»(ref-430927-S12106488672011101900000)
  2. To access the rear electronic module (REM), see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-430924-S11839078312011101900000)
  3. For information about signals, see «Signal specification»(ref-430923-S19121820782011101900000)
  4. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .
  1. Continue Refer to «Verification»(ref-431020-S38616926192011101900000)

Check the rear electronic module (REM) and the high-mounted stop lamp connectors. Check for contact resistance and oxidation. Check for loose connections. Check for damage carefully.

HINT: When the stop lamp is activated, the voltage between #1 and #5 in the connector for the stop lamp must be battery voltage.

Check the power supply cable between rear electronic module (REM) terminal #4D (#B04) and brake light connector terminal #1. Check for an open-circuit. Check for a short-circuit to ground.

Check the ground lead between brake light connector terminal #5 and the ground terminal. Check for an open-circuit. Check for a short-circuit to supply voltage.

Try a new brake light if no faults were found.

Remedy as necessary.

Other information

  1. To access / replace the high mounted stop lamp, see «Stop lamp, rear windshield, replacing»(ref-430927-S12106488672011101900000)
  2. To access the rear electronic module (REM), see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-430924-S11839078312011101900000)
  3. For information about signals, see «Signal specification»(ref-430923-S19121820782011101900000)
  4. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .
  1. Continue Refer to «Verification»(ref-431020-S30022396632011101900000)
  1. Ignition off
  2. Disconnect connectors A and F on the rear electronic module (REM). Check the signal cable. Check for an open-circuit. Check for a short-circuit to supply voltage. For the V70, XC70 and XC90 Take readings between: Rear electronic module (REM) terminal #F4 (#44) and terminal #1 on the connector for the high level stop lamp. Remedy as necessary. 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-S32119514992011101900000)

Check that the back-up (reversing) lamp relay (position 2/80) is correctly installed.

Check the relay terminal (2/80). Check for a short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults . Check for loose connections according to Loose connections (terminals) .

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S19121820782011101900000) .
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000) .
  3. To access the rear electronic module, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-451767-S28873772202012020900000) .
  4. When the relay is installed and activated, the voltage at the relay guide should be 0 V.
  1. Continue Refer to «Information»(ref-431020-S00101534882011101900000)

Check that the back-up (reversing) lamp relay (position 2/80) is correctly installed.

Check the relay terminal (2/80). Check for contact resistance and oxidation according to Contact resistance and oxidation . Check for loose connections according to Loose connections (terminals) .

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S19121820782011101900000) .
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000) .
  3. To access the rear electronic module, see «Relay/fuse box cargo compartment/Rear electronic module (REM), replacing»(ref-451767-S28873772202012020900000) .
  4. When the relay is installed and activated, the voltage at the relay guide should be 0 V.
  1. Continue Refer to «Information»(ref-431020-S25558516482011101900000)

Check that the position sensor for the xenon lamp is correctly installed.

Check the cable between rear electronic module (REM) terminal #B8 (terminal #A28) and position sensor terminal #4. Check for a short-circuit to supply voltage.

Remedy as necessary.

Other information

  1. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000)
  2. For information about signals, see «Signal specification»(ref-430923-S19121820782011101900000)
  3. To access or replace the position sensor for the Xenon lamp, see «Replacing position sensors for Bi-Xenon lamps»(ref-431006-S11040000732011101900000)
  4. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .
  1. Continue Refer to «Verification»(ref-431020-S22285577362011101900000)
  1. Ignition off
  2. Disconnect the connector on the rear electronic module (REM). Check that the position sensor for the Xenon lamp is correctly installed. Check the signal cable. Check for a short-circuit to supply voltage. Take readings between: Rear electronic module (REM) terminal #C6 (#46) and terminal #4 on the position sensor for the Xenon lamp. Check the power supply and the ground connection for the position sensor. Remedy as necessary. Other information See «Connecting the breakout box»(ref-430921-S40351701642011101900000) See «Signal specification»(ref-430923-S36978396402011101900000) See «Replacing position sensors for Bi-Xenon lamps»(ref-431006-S11040000732011101900000) See «Contents»(ref-430909-S26456997912011101900000)
  1. Continue Refer to «Verification»(ref-431020-S01396220432011101900000)

Check that the position sensor for the xenon lamp is correctly installed.

Check the cable between the rear electrical module terminal #B8 (#A28) and position sensor terminal #4. Check the cable between rear electrical module terminal #B10 (#A30) and position sensor terminal #5. Check the cable between rear electrical module terminal #B6 (#A26) and position sensor terminal #1. Check for an open-circuit. Check for a short-circuit to ground.

Remedy as necessary.

Other information

  1. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000)
  2. For information about signals, see «Signal specification»(ref-430923-S19121820782011101900000)
  3. To access or replace the position sensor for the Xenon lamp, see «Replacing position sensors for Bi-Xenon lamps»(ref-431006-S11040000732011101900000)
  4. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .
  1. Continue Refer to «Verification»(ref-431020-S17821294752011101900000)
  1. Ignition off
  2. Disconnect the connector on the rear electronic module (REM). Check that the position sensor for the Xenon lamp is correctly installed. Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground. Take readings between: Rear electronic module (REM) terminal #C6 (#46) and terminal #4 on the position sensor for the Xenon lamp. Check the power supply and the ground connection for the position sensor. Remedy as necessary. Other information See «Connecting the breakout box»(ref-430921-S40351701642011101900000) See «Signal specification»(ref-430923-S36978396402011101900000) See «Replacing position sensors for Bi-Xenon lamps»(ref-431006-S11040000732011101900000) See «Contents»(ref-430909-S26456997912011101900000)
  1. Continue Refer to «Verification»(ref-431020-S41729797192011101900000)

Check that the "Rear windshield defroster" relay 2/82 is correctly installed.

Check the rear electronic module connector and relay terminal 2/82. Check for contact resistance and oxidation according to Contact resistance and oxidation . Check for loose connections according to Loose connections (terminals) .

Check the cable between rear electronic module terminal #D1 (#B01) and "Rear windshield defroster" relay 2/82 terminal #2. Check for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults . Check for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S19121820782011101900000) .
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000) .
  3. When the relay is installed and activated, the voltage at the relay guide should be 0 V.
  1. Continue Refer to «Information»(ref-431020-S32013641612011101900000)

Check the cable between rear electronic module terminal #D1 (#B01) and "Rear windshield defroster" relay 2/82 terminal #2 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

Check the relay terminal, in particular relay guide 2/82 terminal #2, for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

Remedy as necessary.

Try a new relay if no faults are found.

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S19121820782011101900000) .
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000) .
  3. When the relay is installed and activated, the voltage at the relay guide should be 0 V.
  1. Continue Refer to «Verification»(ref-431020-S17298060172011101900000)

Check that the "Rear windshield defroster" relay 2/82 is correctly installed.

Check the rear electronic module connector and relay terminal 2/82. Check for contact resistance and oxidation according to Contact resistance and oxidation . Check for loose connections according to Loose connections (terminals) .

Check the cable between main fuse 11E/5 and "Rear windshield defroster" relay 2/82 terminal #5. Check the cable between main fuse 11D/5 and "Rear windshield defroster" relay 2/82 terminal #1. Check the cable between rear electronic module terminal #D1 (#B01) and "Rear windshield defroster" relay 2/82 terminal #2. Check these cables for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults . Check for an intermittent open-circuit according to Open-circuit, intermittent faults .

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S19121820782011101900000) .
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000) .
  3. When the relay is installed and not activated, the voltage at the relay guide should be 12 V.
  1. Continue Refer to «Information»(ref-431020-S12322472062011101900000)

Check that the "Rear windshield defroster" relay 2/82 is intact. Check that the relay is correctly installed.

Check that the main fuse 11E/5 and 11D/5 is intact.

Check the cable between main fuse 11E/5 and "Rear windshield defroster" relay 2/82 terminal #5. Check the cable between main fuse 11D/5 and "Rear windshield defroster" relay 2/82 terminal #1. Check the cable between rear electronic module terminal #D1 (terminal #B01) and "Rear windshield defroster" relay 2/82 terminal #2. Check these cables for an open-circuit according to Open-circuit, permanent faults .

Check the relay terminal for an open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Try a new relay if no faults are found.

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S19121820782011101900000) .
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S23007515712011101900000) .
  3. When the relay is installed and not activated, the voltage at the relay guide should be 12 V.
  1. Continue Refer to «Verification»(ref-431020-S04829494142011101900000)
  1. Ignition off
  2. Disconnect connectors D and F on the rear electronic module (REM). Check the signal cable. Check for a short-circuit to ground. 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-S04159470182011101900000)
  1. Ignition off
  2. Disconnect connector D on the rear electronic module (REM). The diagnostic trouble code (DTC) is stored if there is no communication between the rear electronic module (REM) and the parking assistance module (PAM). This may be due to a fault in the signal cable between the control modules or a defective communication device in one or all of the control modules. Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage. Take readings between: Rear electronic module (REM) terminal #D32 (#32) and parking assistance module (PAM) terminal #A12. Remedy as necessary. Other information See «Connecting the breakout box»(ref-430921-S40351701642011101900000) See «Signal specification»(ref-430923-S36978396402011101900000) See «Parking assistance module (PAM), replacing»(ref-451758-S35803821152012020900000) See «Contents»(ref-430909-S26456997912011101900000)

Was a fault detected?

  1. YES Refer to «Verification»(ref-431020-S02107334472011101900000)
  2. NO Refer to «Replacing the control module»(ref-431020-S42832786272011101900000)
  1. Ignition off
  2. Disconnect connector D on the rear electronic module (REM). The diagnostic trouble code (DTC) is stored if there is no communication between the rear electronic module (REM) and the parking assistance module (PAM). This may be due to a fault in the signal cable between the control modules or a defective communication device in one or all of the control modules. Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground. Take readings between: Rear electronic module (REM) terminal #D32 (#32) and parking assistance module (PAM) terminal #A12. Remedy as necessary. Other information See «Connecting the breakout box»(ref-430921-S40351701642011101900000) See «Signal specification»(ref-430923-S36978396402011101900000) See «Parking assistance module (PAM), replacing»(ref-451758-S35803821152012020900000) See «Contents»(ref-430909-S26456997912011101900000)

Was a fault detected?

  1. YES Refer to «Verification»(ref-431020-S37270002682011101900000)
  2. NO Refer to «Replacing the control module»(ref-431020-S21067401862011101900000)
  1. Ignition off
  2. Disconnect connector D on the rear electronic module (REM). The diagnostic trouble code (DTC) is stored if there is no communication between the rear electronic module (REM) and the parking assistance module (PAM). This may be due to a fault in the signal cable between the control modules or a defective communication device in one or all of the control modules. Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground. Take readings between: Rear electronic module (REM) terminal #D32 (#32) and parking assistance module (PAM) terminal #A12. Remedy as necessary. Other information See «Connecting the breakout box»(ref-430921-S40351701642011101900000) See «Signal specification»(ref-430923-S36978396402011101900000) See «Parking assistance module (PAM), replacing»(ref-451758-S35803821152012020900000) See «Contents»(ref-430909-S26456997912011101900000)

Was a fault detected?

  1. YES Refer to «Verification»(ref-431020-S04138269012011101900000)
  2. NO Refer to «Replacing the control module»(ref-431020-S26567453602011101900000)
  1. Ignition off
  2. Disconnect connector D on the rear electronic module (REM). Check that the fuse for the control module is intact. The diagnostic trouble code (DTC) is stored if there is no communication between the rear electronic module (REM) and the parking assistance module (PAM). This may be due to a fault in the signal cable between the control modules or a defective communication device in one or all of the control modules. Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground. Take readings between: Rear electronic module (REM) terminal #D32 (#32) and parking assistance module (PAM) terminal #A12. Remedy as necessary. Other information See «Connecting the breakout box»(ref-430921-S40351701642011101900000) See «Signal specification»(ref-430923-S36978396402011101900000) See «Parking assistance module (PAM), replacing»(ref-451758-S35803821152012020900000) See «Contents»(ref-430909-S26456997912011101900000)

Was a fault detected?

  1. YES Refer to «Verification»(ref-431020-S08372862062011101900000)
  2. NO Refer to «Replacing the control module»(ref-431020-S30269117822011101900000)
  1. Ignition off
  2. Disconnect connector D on the rear electronic module (REM). The diagnostic trouble code (DTC) is stored if there is no communication between the rear electronic module (REM) and the inclination sensor module (ISM). This may be due to a fault in the signal cable between the control modules or a defective communication device in one or all of the control modules. Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage. Take readings between: Rear electronic module (REM) terminal #D26 (#26) and the inclination sensor module (ISM) terminal #2. Remedy as necessary. Other information See «Connecting the breakout box»(ref-430921-S40351701642011101900000) See «Signal specification»(ref-430923-S36978396402011101900000) See «Tilt sensor alarm, replacing»(ref-431006-S30649679772011101900000) See «Contents»(ref-430909-S26456997912011101900000)

Was a fault detected?

  1. YES Refer to «Verification»(ref-431020-S14466950572011101900000)
  2. NO Refer to «Replacing the control module»(ref-431020-S01188626832011101900000)
  1. Ignition off
  2. Disconnect connector D on the rear electronic module (REM). The diagnostic trouble code (DTC) is stored if there is no communication between the rear electronic module (REM) and the inclination sensor module (ISM). This may be due to a fault in the signal cable between the control modules or a defective communication device in one or all of the control modules. Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage. Take readings between: Rear electronic module (REM) terminal #D26 (#26) and the inclination sensor module (ISM) terminal #2. Remedy as necessary. Other information See «Connecting the breakout box»(ref-430921-S40351701642011101900000) See «Signal specification»(ref-430923-S36978396402011101900000) See «Tilt sensor alarm, replacing»(ref-431006-S30649679772011101900000) See «Contents»(ref-430909-S26456997912011101900000)

Was a fault detected?

  1. YES Refer to «Verification»(ref-431020-S05060592362011101900000)
  2. NO Refer to «Replacing the control module»(ref-431020-S29938386952011101900000)

Checking wiring and connectors

Check the power supply cable between upper electronic module (UEM) connector terminal #10 and movement sensor connector terminal #1. Check for an intermittent open-circuit. Check for an open-circuit.

Also check both connectors for contact resistance and oxidation.

If no fault was found, try a new sensor.

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S15249807432011101900000)
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S34302379142011101900000)
  3. To replace the movement/rear level sensor, see «Replacing the movement sensor»(ref-431006-S28635479452011101900000)
  4. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .

Scheme 1866

Scheme 1866
Scheme 1866
  1. Continue Refer to «Verification»(ref-431020-S34833740252011101900000)

Check the power supply cable between upper electronic module (UEM) connector terminal #10 and mass movement sensor connector terminal #1. Check for a short-circuit to ground. Check for an intermittent short-circuit to ground.

If no fault was found, try a new sensor.

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S15249807432011101900000)
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S34302379142011101900000)
  3. To replace the movement/rear level sensor, see «Replacing the movement sensor»(ref-431006-S28635479452011101900000)
  4. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .
  1. Continue Refer to «Verification»(ref-431020-S17535880362011101900000)

Check the power supply cable between upper electronic module (UEM) connector terminal #10 and mass movement sensor connector terminal #1. Check for a short-circuit to supply voltage. Check for an intermittent short-circuit to supply voltage.

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S15249807432011101900000)
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S34302379142011101900000)
  3. To replace the movement/rear level sensor, see «Replacing the movement sensor»(ref-431006-S28635479452011101900000)
  4. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .
  1. Continue Refer to «Verification»(ref-431020-S29432774982011101900000)

Check the signal cable between upper electronic module (UEM) connector terminal #22 and mass movement sensor (MMS) connector terminal #3. Check for a short-circuit to ground. Check for an intermittent short-circuit to ground.

If no fault was found, try a new sensor.

Other information

  1. For further information about signals and other values, see «Signal specification»(ref-430923-S15249807432011101900000)
  2. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S34302379142011101900000)
  3. To replace the movement/rear level sensor, see «Replacing the movement sensor»(ref-431006-S28635479452011101900000)
  4. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .
  1. Continue Refer to «Verification»(ref-431020-S20664122622011101900000)

Check the signal cable between the upper electronic module (UEM) connector terminal #22 (22) and movement sensor terminal connector terminal #3. Check for an open-circuit. Check for an intermittent open-circuit.

Also check the relevant connectors. Check for oxidation.

Other information

  1. To connect the breakout box: «Connecting the breakout box»(ref-430921-S34302379142011101900000)
  2. For information about upper electronic module (UEM) signals: «Signal specification»(ref-430923-S15249807432011101900000)
  3. See «Replacing the movement sensor»(ref-431006-S28635479452011101900000)
  4. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .

Was a fault detected?

  1. YES Refer to «Verification»(ref-431020-S01714876182011101900000)
  2. NO Refer to «Checking wiring and connectors»(ref-431020-S30258384542011101900000)

Check the signal cable. Check for a short-circuit to supply voltage. Check for an intermittent short-circuit to supply voltage.

Other information

  1. To connect the breakout box: «Connecting the breakout box»(ref-430921-S34302379142011101900000)
  2. For information about upper electronic module (UEM) signals: «Signal specification»(ref-430923-S15249807432011101900000)
  3. See «Replacing the movement sensor»(ref-431006-S28635479452011101900000)
  4. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000)

Was a fault detected?

  1. YES Refer to «Verification»(ref-431020-S01714876182011101900000)
  2. NO Refer to «Checking wiring and connectors»(ref-431020-S32952055882011101900000)

Check the power supply cable between upper electronic module (UEM) connector terminal #10 and movement sensor connector terminal #1. Check for an open-circuit. Check for a short-circuit to ground. Check for an intermittent open-circuit.

Other information

  1. To connect the breakout box: «Connecting the breakout box»(ref-430921-S34302379142011101900000)
  2. For information about upper electronic module (UEM) signals: «Signal specification»(ref-430923-S15249807432011101900000)
  3. See «Replacing the movement sensor»(ref-431006-S28635479452011101900000)
  4. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000)

Was a fault detected?

  1. YES Refer to «Verification»(ref-431020-S01714876182011101900000)
  2. NO Refer to «Checking wiring and connectors»(ref-431020-S22526012832011101900000)

Check the ground lead between movement sensor connector terminal #5 and the ground terminal 31/83. Check for an open-circuit. Check for an intermittent open-circuit.

Check in particular intermediate connector (54/13:20) in the cable harness.

If no fault was found, try a new sensor.

Other information

  1. To connect the breakout box: «Connecting the breakout box»(ref-430921-S34302379142011101900000)
  2. For information about upper electronic module (UEM) signals: «Signal specification»(ref-430923-S15249807432011101900000)
  3. See «Replacing the movement sensor»(ref-431006-S28635479452011101900000)
  4. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000)
  1. Continue Refer to «Verification»(ref-431020-S01714876182011101900000)

More articles — Rear Electronic Module (REM) & Upper Electronics Module (Uem) Diagnostic Trouble Codes (Xc)