Trailer Module (Trm) Diagnostic Trouble Codes: Wiring Volvo XC70 II

CHECKING THE WIRING AND TERMINALS

1. Disconnect any connection from the socket for the tow hitch connector.
2. Ignition off.
3. Cut off voltage feed to Trailer module (TRM) by removing the battery's minus cable.
4. Disconnect the connector for the Trailer module (TRM).
5. Disconnect the connector from the vehicle's left tail light. Check connectors for damage to pins and connections. Check the connectors. Check for loose connections. Check for contact resistance. Check for oxidation. Check the lead for open circuit or short-circuiting to ground. Take readings between: Trailer module (TRM) #C2:3(#24) and the connector for the vehicle's left tail light #C1:6. The vehicle's left tail light #C1:6 and central electronic module (CEM) C2:59. Remedy as necessary. Other information Trailer module (TRM): «CONNECTING THE BREAKOUT BOX»(ref-495368-S34933650072012082100000) Central electronic module (CEM): «CONNECTING THE BREAKOUT BOX»(ref-495323-S29210678802012082100000) Trailer module (TRM): «SIGNAL SPECIFICATION»(ref-495369-S22284618202012082100000) Central electronic module (CEM): «SIGNAL SPECIFICATION»(ref-495325-S35767071362012082100000) see «BATTERY DISCONNECTING AND CONNECTING»(ref-495407-S17646253862012082100000) see «TRAILER MODULE (TRM)»(ref-495519-S29580375472012082100000) Central electronic module (CEM): «CONTROL MODULE RELAY BOX PASSENGER COMPARTMENT»(ref-495326-S11936318512012082100000) see «CHECKING WIRING AND TERMINALS»(ref-495309-S37197517212012082100000)

1. Continue Refer to «VERIFICATION»(ref-495518-S01347329022012082100000)

1. Disconnect any connection from the socket for the tow hitch connector.
2. Ignition off.
3. Cut off voltage feed to Trailer module (TRM) by removing the battery's minus cable.
4. Disconnect the connector for the Trailer module (TRM).
5. Disconnect the connector from the vehicle's left tail light. Check connectors for damage to pins and connections. Check the connectors. Check for loose connections. Check for contact resistance. Check for oxidation. Check the lead for open circuit or short-circuiting to ground. Take readings between: Trailer module (TRM) #C2:3(#24) and the connector for the vehicle's left tail light #C1:6. The vehicle's left tail light #C1:6 and central electronic module (CEM) C2:59. Remedy as necessary. Other information Trailer module (TRM): «CONNECTING THE BREAKOUT BOX»(ref-495368-S34933650072012082100000) Central electronic module (CEM): «CONNECTING THE BREAKOUT BOX»(ref-495323-S29210678802012082100000) Trailer module (TRM): «SIGNAL SPECIFICATION»(ref-495369-S22284618202012082100000) Central electronic module (CEM): «SIGNAL DESCRIPTION CENTRAL ELECTRONIC MODULE (CEM)»(ref-495325-S23462318842012082100000) see «BATTERY DISCONNECTING AND CONNECTING»(ref-495407-S17646253862012082100000) see «TRAILER MODULE (TRM)»(ref-495519-S29580375472012082100000) Central electronic module (CEM): «CONTROL MODULE RELAY BOX PASSENGER COMPARTMENT»(ref-495326-S26978871612012082100000) «CONTROL MODULE RELAY BOX PASSENGER COMPARTMENT»(ref-511722-S01490730422012102900000) see «CHECKING WIRING AND TERMINALS»(ref-495309-S37197517212012082100000)

1. Continue Refer to «VERIFICATION»(ref-495518-S05353558722012082100000)

1. Ignition off. Check fuses. Check the cable harness and connectors. Check the battery voltage. Check the charging function of the generator (GEN). Disconnect the connector for the Trailer module (TRM). Check voltage feed and ground connection for Trailer module (TRM). HINT: Also perform a check of the cable resistance across the cable harness from rear relay and fuse box to Trailer module (TRM). Check voltage feed and ground connection for Central electronic module (CEM). Remedy as necessary. Other information see «CONNECTING THE BREAKOUT BOX»(ref-495368-S34933650072012082100000) see «SIGNAL SPECIFICATION»(ref-495369-S22284618202012082100000) see «FAULT-TRACING AND TESTING THE BATTERY»(ref-495407-S31628632682012082100000) see «CHECKING THE POWER SUPPLY AND GROUND TERMINAL»(ref-495368-S21568295832012082100000) see «TRAILER MODULE (TRM)»(ref-495519-S29580375472012082100000) see «CHECKING WIRING AND TERMINALS»(ref-495309-S37197517212012082100000)

1. Continue Refer to «VERIFICATION»(ref-495518-S17680289852012082100000)