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

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

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.

Plug connector, new AHM4
Plug connector, old AHM3(+)

Fig 1: Identifying Plug Connectors

Courtesy of BMW OF NORTH AMERICA, INC.

Necessary preliminary tasks

Remove trailer module

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

Installation:

Cut out device holder up to marking (1).

Cut out indentation in area (2).

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

Fig 2: Identifying Device Holder Cutting Marking And Indentation Cutting Area

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Positions of plugs 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 equipments are not fitted.

Special tools for disconnecting

Secondary lock:

Special tool 61 0 324 RELEASE TOOL

Primary lock:

Special tool 61 0 316 RELEASE TOOL

Special tool for crimping

Double flat spring contact:

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

SPECIAL CRIMPING TOOLS DESCRIPTION CHART

(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 and encoding.