Upper Electronics Module (Uem) Diagnostic Trouble Codes (Xc): Wiring Volvo V70 II

Checking the wiring

Check the connector to the sun roof motor. Check for contact resistance and oxidation. Check for loose connections.

Other information

1. To access the sun roof motor connector, see «Motor sun roof, replacement»(ref-430952-S21500415122011101900000)
2. See «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .

1. Continue Refer to «Replacing the sun roof motor»(ref-431021-S32204853982011101900000)

There is either a fault in the supply voltage or in the ground lead. Check the power supply cable against a ground terminal (the chassis).

HINT: If the voltage is 12 V the fault is in the ground lead. Other wise the fault is in the power supply cable.

Remedy as necessary.

Other information

1. To access or replace the control module, see «Interior lighting and upper electronic module (UEM), replacing»(ref-430927-S13783131922011101900000)
2. See «Rain sensor»(ref-431006-S36613426452011101900000)
3. For further information about signals and other values, see «Signal specification»(ref-430923-S15249807432011101900000)
4. To connect the breakout box, see «Connecting the breakout box»(ref-430921-S34302379142011101900000)
5. To fault-trace the wiring and terminals, see «Checking wiring and terminals»(ref-430909-S05889726072011101900000) .

1. Continue Refer to «Verification»(ref-431021-S19905256182011101900000)

1. HINT: The wiring between the upper electronic module (UEM) and the rain sensor consists of two cables.
2. Windshield wiper stalk in position "0". Check the cable between upper electronic module (UEM) terminal #13 (#A13) and rain sensor terminal #1. Check for a short-circuit to supply voltage. HINT: Resistance between the power supply cable to the rain sensor terminal #8 (#A8) and the data cable to the rain sensor terminal #13 (#A13) should be infinite. The resistance between the data cable to the rain sensor terminal #13 (#A13) and the 30-supply to the upper electronic module (UEM) terminal #11 (#A11) should be infinite. Remedy as necessary. Other information See «Interior lighting and upper electronic module (UEM), replacing»(ref-430927-S13783131922011101900000) See «Rain sensor»(ref-431006-S36613426452011101900000) See «Signal specification»(ref-430923-S15249807432011101900000) See «Connecting the breakout box»(ref-430921-S34302379142011101900000) See «Checking wiring and terminals»(ref-430909-S05889726072011101900000)

1. Continue Refer to «Verification»(ref-431021-S24548334422011101900000)

1. Ignition off. Check the connectors for the upper electronic module (UEM) and rain sensor. Check for contact resistance and oxidation. Also check the rain sensor and GSM antenna wiring (if applicable). Ensure that there are no sources of interference nearby. Remedy as necessary. Other information: See «Interior lighting and upper electronic module (UEM), replacing»(ref-430927-S13783131922011101900000) See «Rain sensor»(ref-431006-S36613426452011101900000) See «Signal specification»(ref-430923-S15249807432011101900000) See «Checking wiring and terminals»(ref-430909-S05889726072011101900000)

1. Continue Refer to «Verification»(ref-431021-S03170520972011101900000)