Fault code 39: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING (FAULT CODE 39)

Work instruction			Display OK	If not OK
1	Check power supply of the signal converter	Switch off ignition Pull plug off the signal converter Switch on terminal 86 S Measure voltage between plug on the signal converter pin 5 and ground Measure voltage between the plug on the signal converter pin 5 and pin 4	> 11 V Step 2	Repair wiring harness
2	Check wiring from signal converter to alarm system control module for short circuit to ground	Switch off ignition Pull plug A off the alarm system control module Measure resistance between plug on alarm system pin 3 and ground Measure resistance between plug on alarm system pin 4 and ground	Step 3	Repair wiring harness -> End
3	Check wiring from signal converter to alarm system control module for short circuit to B+	Switch on ignition Measure voltage between plug A on control module pin 3 and ground Measure voltage between plug A on control module pin 4 and ground	0 V Step 4	Repair wiring harness -> End
4	Check wiring from signal converter to alarm system control module for open circuit	Switch off ignition Measure resistance between plug A on control module pin 3 and plug on signal converter pin 8 Measure resistance between plug A on control module pin 4 and plug on signal converter pin 6	< 5 Step 5	Repair wiring harness -> End
5	Replace signal converter		-> End