61 35 502 Replacing trailer module(09/2001-09/2006)

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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 Connector Models

Courtesy of BMW OF NORTH AMERICA, INC.

Necessary preliminary tasks:

Remove TRAILER MODULE

Up to build date/version 03/2007 Series E60/61:

Installation:

Cut out device holder up to marking (1).

Make sure wiring harness is exactly routed.

Fig 2: Identifying Marking On Device Holder

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 for secondary lock)

Primary lock:

Special tool 61 0 316 (Release tool for flat spring contacts with double retaining tab "SPT 4.8" "JPT 2.8")

Special tool for crimping:

Double flat spring contact:

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

SPECIAL TOOL FOR CRIMPING REFERENCE CHART

(09/2001 - 09/2006)
Previously AHM3(+)		New AHM4R
Pin no.	Contact (mm² )	Pin no.	Contact (mm² )
1	2.8	13	2.8
1*	2.8	20	2.8
NOTE: (1*) Disconnect cable terminal 1 (AHM3) and separate contact. Crimp cable link (Y-branch) on cable terminal 1 (AHM3) with butt connector and connect to terminal 13 and terminal 20 (AHM4).
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
Recrimp contact from 0.63 mm² to 2.8 mm²
11	0.63	14	2.8
Recrimp contact from 0.63 mm² to 2.8 mm²
12	0.63	15	2.8
Recrimp contact from 0.63 mm² to 2.8 mm²
13	0.63	19	2.8
Recrimp contact from 0.63 mm² to 2.8 mm²
14	0.63	12	2.8
Recrimp contact from 0.63 mm² to 2.8 mm²
15	0.63	16	0.63
16	0.63	1	2.8
Recrimp contact from 0.63 mm² to 2.8 mm²
-	-	4-8	0.63

Carry out VEHICLE PROGRAMMING/CODING .