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SIGNAL SWITCHED ON Ignition switch in position II. 1 SWITCH ON the left-hand turn signal. 2 Measure the voltage between the trailer socket, and ground. 3 Does the voltage alternate between 0 V and battery Continue fault finding on the trailer. No GO to B3 . B3: CHECK CIRCUIT CAT06A (BU) BETWEEN THE TRAILER MODULE (TRM) AND THE Ignition switch in position 0. 1 Disconnect TRM from connector C4AT23-A. 2 Measure the resistance between the TRM, wiring harness side and the trailer socket, 3 Is a resistance of less than 2 Ohms registered? GO to B4 . No LOCATE and RECTIFY the break in the circuit B4: CHECK CIRCUIT CAT06A (BU) 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? INSTALL A NEW TRM. CHECK system operates
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