Fault code 5: Diagnosis/Troubleshooting

Diagnosis/Troubleshooting (FAULT CODE 5)

Work instruction			Display OK	If not OK
1	Check angle sensor plug for HBA, front	Switch off ignition Pull plug off the angle sensor for HBA, front Switch ignition on Delete the fault memory and read out again. Observe whether fault code 5 reappears. If fault code 5 does not reappear, the supply lead or the angle sensor for HBA, front, is faulty.	"Continue with 2"	Check the angle sensor plug for HBA for moisture and corrosion, or replace angle sensor for HBA, front. "End"
2	Check plug on the angle sensor for HBA, rear	Switch off ignition Reattach plug to the angle sensor for HBA, front Pull plug off the angle sensor for HBA, rear Switch ignition on Delete the fault memory and read out again. Observe whether fault code 5 reappears. If fault code 5 does not reappear, the plug on the angle sensor for HBA, rear, is faulty.	"Continue with 3"	Check the angle sensor plug for HBA for moisture and corrosion, or replace angle sensor for HBA, rear. "End"
3	Check 5 V supply voltage of the sensor	Switch off ignition Pull plug off the angle sensor for HBA, front Switch ignition on Measure voltage between pin 5 of the sensor plug and ground	approx. 5 V "Continue with 4"	"Continue with 5"
4	Check ground lead of the sensor	Measure voltage between pin 5 and pin 1 of the angle sensor for HBA, front	approx. 5 V "Continue with 9"	"Continue with 8"
5	Check 5 V supply lead for short to ground	Switch off ignition Pull plug off the angle sensor for HBA, rear Pull plug off the control module for HBA Measure resistance between the plug on the control module for HBA pin 14 and ground Measure resistance between the plug on the control module for HBA pin 14 and pin 17	"Continue with 6"	Repair wiring harness "End"
6	Check 5 V supply lead for short to B+	Switch ignition on Measure voltage between the plug on the control module for HBA pin 14 and ground	0 V "Continue with 7"	Repair wiring harness "End"
7	Check 5 V supply lead for open circuit	Switch off ignition Measure resistance between the plug on the control module for HBA pin 14 and the plug on the angle sensor for HBA, front, pin 5 Measure resistance between the plug on the control module for HBA pin 14 and the plug on the angle sensor for HBA, rear, pin 5	< 5 "Continue with 10"	Repair wiring harness "End"
8	Check ground lead of the sensors for open circuit	Measure resistance between the plug on the control module for HBA pin 17 and the plug on the angle sensor, front, pin 1 Measure resistance between the plug on the control module for HBA pin 17 and the plug on the angle sensor, rear, pin 1	< 5 "Continue with 10"	Repair wiring harness "End"
9	Replace angle sensor for HBA at front or rear.		"End"
10	Replace control module		"End"