BMW GM III or General Module 3 page
The BMW GM III is used on several cars such as the E39 5-series 1995-2004, E38 7-series 194-2001 and the E53 X5 2000-2006 series. I am still researching the GM3, but, it seems that there are more than 1 major type of GM3. One uses the 3 of the V23078-C1002-A303 relays and 2 of the V23072-C1061-A303 relays. The other version of the GM3 contains completely different relays. I will post information up on this web page as soon as I get it.
The GM III were made under a variety of part numbers including
the following.
61356935891 X5 (discontinued)
61356946948 X5 (discontinued)
61356946947 X5
61356960250 X5 (discontinued)
61359117102 X5 Current ($364.64
at ECS Tuning)
61356901224 5-Series (discontinued)
61356913517 5-Series (discontinued)
61356922272 5-Series (discontinued)
61356938461 5-Series (discontinued)
61356942042 5-Series Current ($364.64
at ECS Tuning)
I got another P/N 61356920822 from a E53 X5.
61356901230 GMIII HIGH from E38 00 740iL
61356901230 GMIII HIGH from E39 00 M5
61356913524 GMIII HIGH from E39 02 M5
61356960249 E53
61358352057 GMIII ????
61358364696 GMIII HIGH from E38 95&96 740iL
61358372141 GMIII HIGH
61358376392 GMIII HIGH
61358376640 GMIII HIGH from E39 97 528i, 540is
61358376640 GMIII HIGH from E38 98 740i
61358376642 GMIII HIGH from E39 97 528i
61358376690 GMIII HIGH from E39 97 528i
61358376692 GMIII HIGH
61358378631 GMIII HIGH
61358381966 GMIII HIGH from E38 99 740i
61358381966 GMIII HIGH from E38 00 740iL
61358381966 GMIII HIGH from E39 99 528it
61358382377 GMIII LOW from E39 00 540i
Unlike the GM5 used in the E46, 3-Series, the GM3 does not supply power to the front door lock motors or the front window motors. They are instead connected via the P-Bus to the PM-FT/SB modules, 1 in each of the two front doors. The PM-FT/SB modules detect the state of the key cylinder via two hall sensors and the open/closed state of the door via another hall sensor. Each PM module is responsible for powering the window motor and the door lock motor. The door lock motor is powered by an H-bridge power MOSFET output circuit. This is good since MOSFETs do not wear out like relays. Check out my new PM Module web page.
The GM3 does directly control the rear windows motors, the rear door lock motors and the fuel filler flap lock motor. I believe these are all controlled via relays.
11/3/08 - Today I got my GM3 module (61.35-8378631) that I bought off eBay and cracked it open. The module has 5 relays inside. Three are the familar V23078-C1002-A303 that are used for front windows in the GM4 and GM5 modules and two are the V23072-C1061-A303 which is also used in the GM4 module.
I got a hold of some wiring diagrams for the E39 and with that I started reverse engineering the GM3 board. I have figured out the following. I have arbitraily numbered the relays RLY1-5. I have both types of relays in stock. The big relays, V23078-C1002-A303, are available here. The smaller relays, V23072-C1061-A303, are available here.
GM3 Wiring Connections Web Page
BMW General Module II (GM2) Page
BMW General Module IV (GM4) Page