61 35 502 Replacing the trailer module (09/2006-03/2009)

Special tools required:

NOTE: From 03/2009 trailer module AHM3+ will be replaced by trailer module AHM4R.

Plug connectors and associated pin assignments must be adapted if the old plug connector AHM3(+) is fitted.

New plug connector (AHM4)
Previous plug connector (AHM3+)

Fig 1: Identifying Versions Of Plug Connector

Courtesy of BMW OF NORTH AMERICA, INC.

Necessary preliminary tasks:

Remove trailer module

From build date/version 03/2007 Series E60/61:

Installation note:

Cut out equipment holder up to mark (1).

Cut out indentation in area (2).

Make sure AHM module is exactly seated and wiring harness is correctly routed.

Fig 2: Cutting Out Equipment Holder

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Positions of connectors and associated pin assignments are set out in the diagnosis system.

The repair instruction represents the highest vehicle configuration. Pin assignments of plug connections may be absent if optional equipment is not fitted.

Special tools for disconnecting:

Secondary lock:

Special tool 61 0 324

Primary locking device:

Special tool 61 0 316

Special tool for crimping:

Double flat spring contact:

Crimping pliers special tool 61 0 202 (crimping pliers) with special tool 61 0 230 (matrix)

NOTE: Pin no. 3 of AHM3 (+) is no longer used at AHM4R, turn this cable and insulate it.

Pin no. 4-8 at new AHM4R are not used, these remain free.

(09/2006 - 03/2009)
Previously AHM3(+)		New AHM4R
Pin no.	Contact (mm² )	Pin no.	Contact (mm² )
1	2, 8	13	2, 8
2	2, 8	20	2, 8
3	0, 63	-	-
4	0, 63	17	0, 63
5	0, 63	2	0, 63
6	0, 63	3	0, 63
7	0, 63	11	0, 63
8	0, 63	9	0, 63
9	0, 63	10	0, 63
10	0, 63	18	2, 8
Re-crimp contact from 0.63 mm² to 2.8 mm²
11	0, 63	14	2, 8
Re-crimp contact from 0.63 mm² to 2.8 mm²
12	0, 63	15	2, 8
Re-crimp contact from 0.63 mm² to 2.8 mm²
13	0, 63	19	2, 8
Re-crimp contact from 0.63 mm² to 2.8 mm²
14	0, 63	12	2, 8
Re-crimp contact from 0.63 mm² to 2.8 mm²
15	0, 63	16	0, 63
16	0, 63	1	2, 8
Re-crimp contact from 0.63 mm² to 2.8 mm²
-	-	4-8	0, 63

Carry out VEHICLE PROGRAMMING/CODING .