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12.1 Signaling Device (SD) - Horn   >   12 Diagnosis - Complaint Related Diagnostic Chart

Complaint/Problem Possible cause Test step/Remedy 1) Horn does not function Wiring Fanfare horns (H2), horn relay (K40/2k6) Driver-side fuse and relay module box (K40/2) Horn switch (S4/2) Following causes are possible only if other system do not function properly (turn signals, wipers etc.): CAN Data line between signal pickup and activation module (SAM) left front and electronic ignition lock control module N10/1 N73 23 1.0 23 2.0 23 4.0 23 8.0 23 3.0 23 5.0 Connection between HHT and electronic ignition lock control module (N73) and signal pickup and activation module (SAM) left front (N10/1) not possible Wiring Electronic ignition lock control module (N73) 23 3.0 23 5.0 Connection between HHT and signal pickup and activation module (SAM) left front (N10/1) not possible Following causes are possible only if other system do not function properly (turn signals, wipers etc.): CAN Data line between signal pickup and activation module (SAM) left front (N10/1) and electronic ignition lock control module (N73) N73 N10/1 23 8.0 23 5.0 23 3.0 Horn sounds continuously Wiring Horn switch (S4/2), horn/airbag clock spring contact (A45) Horn relay (K40/2k6) Following causes are possible only if other system do not function properly (turn signals, wipers etc.): CAN Data line between signal pickup and activation module (SAM) left front (N10/1) and electronic ignition lock control module (N73) N73 N10/1 23 4.0 23 6.0 23 8.0 23 5.0 23 3.0 1) Observe Preparation for Test, see 22 .