Radio switches on and off and lamps in instrument cluster flicker while driving; and engine does not start - AF54.10-P-6004B

MODEL 163.113 /154 /172 2A as of 145273, 163.113 /154 /172 2X as of 707755 up to 717497 

Damage code	Cause	Remedy
54 019 74	Nut on line connector for circuit 30 (X4/37) does not apply sufficient pressure at contact point, because nut makes contact with line terminal in shoulder area. This leads to occasional voltage drop.	1 Check contact at X4/37 line connector on firewall Replace terminal block nut if it makes contact with the line terminal in the shoulder area (arrow). ↓
		2 Open engine hood and position upright	AR88.40-P-1000GI
		3 Cover right fender with protective fender cover.
		4 Remove battery.	AR54.10-P-0005GH
		5 Remove nut (1) from X4/37 line connector
		6 Install new nut at X4/37 line connector.
			*BA54.10-P-1019-01C
		Ensure that cable is correctly routed. Battery line (3) is located behind positive pole (2) of fuse and relay module.
		7 Wax lines and terminal block X4/37
		8 Install battery.	AR54.10-P-0005GH
		9 Remove protective fender cover.
		10 Mark retaining bracket of battery with blue color. To indicate that new nut is installed.
		11 Read out stored DTC with STAR DIAGNOSIS and erase.

Fig 1: Locating Shoulder Area Of Nut And Terminal

Fig 2: Identifying Battery And Positive Lead For Fuse And Relay Module

Battery

Number	Designation	Model 163
BA54.10-P-1019-01C	Nut for line connector on fire wall Nm	15

Parts ordering notes

Part no.	Designation	Quantity
163 546 00 72	Nut for line connector	1
000 986 33 70 10	Wax preservative	1