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LOCATE and RECTIFY the break in the circuit A9: CHECK CIRCUIT CAT19A (VT) BETWEEN THE TRAILER MODULE (TRM) AND THE Measure the resistance between the trailer socket, wiring harness side and ground. 1 Is a resistance of more than 10,000 Ohm measured? GO to A10 . No LOCATE and RECTIFY the short to ground in the A10: CHECK THE CIRCUIT BETWEEN THE SMART JUNCTION BOX AND THE TRAILER NOTE: Keep the brake pedal depressed during the following measurement. Disconnect TRM from connector C4AT23-C. 1 Ignition switch in position II. 2 APPLY the brakes. 3 Measure the voltage between the TRM, connector harness side and ground. 4 Does the meter display battery voltage? INSTALL A NEW TRM. CHECK system operates No LOCATE and RECTIFY the break in the circuit A11: CHECK THE VOLTAGE AT THE TRAILER SOCKET WITH THE REAR FOG LAMPS Ignition switch in position II. 1 Switch on the REAR FOG LAMPS. 2 Switch on the dipped beam. 3 Measure the voltage between the trailer socket, 4
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