Here's the M Roadster HK amp wiring (archive)

I've double checked the info by looking at the labels on the amp circuit board, and driving a signal through the pin and listening at the speakers. Cars with other build dates may vary. As any good DIY would say, "test twice; cut once" :-)

Connector J3 from the amp is a mystery. It's got tantalizing labels as SUB HI, GAL OUT; but only GAL IN has a wiring connected to it. Anyone has any info/theory on this?

BTW, I've verified that the sub-woofer box behind the seats contains the same HK 5-1/4" speakers as the kick panels. However, I don't believe a straight-forward swap with MBQuarts will work due to limited depth (MBQ's are about 1/4" deeper). It might still be doable with a little creative reworking.

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HK Amp Wiring
M Roadster, 3/98 build date

J1 12-pin AMP connector

pin function wire color
--- -------- ----------
1 12V red/white
2 on/off white
3 ground brown
4 ground brown
5 RBLO+ blue/purple
6 RBLO- blue/gray
7 LFLO+ yellow/red
8 LFLO- yellow/brown
9 RFLO+ blue/red
10 RFLO- blue/brown
11 LBLO+ yellow/gray
12 LBLO- yellow/blue

J2 26-pin Siemens connector

pin function wire color
--- -------- ----------
1 RB- IN blue/gray
2 RB+ IN blue/purple
3 LB+ IN blue/black
4 LB- IN yellow/brown
5-7 n/c n/c
8 RFHI+ yellow/red (LTwtr)
9 RFHI- brown/orange (LTwtr)
10 LBHI+ yellow
11 LBHI- brown
12 RBHI+ blue
13 RBHI- brown
14 RF- IN blue/brown
15 RF+ IN brown/black
16 LF+ IN yellow/red
17 LF- IN yellow/brown
18-20 n/c n/c
21 LFHI+ yellow/green (STwtr)
22 LFHI- yellow/brown (STwtr)
23 RFHI+ blue/brown (STwtr)
24 RFHI- blue/green (STwtr)
25 LFHI+ yellow/blue (LTwtr)
26 LFHI- yellow/gray (LTwtr)

J3 6-pin AMP connector

pin function wire color
--- -------- ----------
1 GAL IN black/white
2 SPATIAL n/c
3 SUB LO n/c
4 GAL OUT n/c
5 SUB OW n/c
6 SUB HI n/c

Notes:
* J1 connector has the thick gauge wires
* pin numbers are labeled on the connectors
* Function is as labeled on the HK Amp circuit board;
RBLO+: Right Back Low-freq speaker positive
* n/c: not connected; STwtr: small tweeter;
red/white: red wire with white stripe

Follow Ups:

Many Thanks!! Mike K. 13:45:43 6/30/98 (0)

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