X610 WS "A"
1-4 stepper motor fond area
5 heater sword
6 aux fan
7 rear window heater relais
8 climate control relais
10 NC
11 NC
12+F20 (30)
13+F20 (30)
14 - 17 stepper motors for air distribution (recirculation)
18 light switch LED
19 light switch LED
20 TXD
21 water valve left side
22 aux water pump relais K8
23 water valve right side
24 front window heating relais K8
25+F20 (30)
26+F20 (30)

X613 BL"C"
1= ground
2=ground
3= NC
4=temp feeler driver side
5= potentiometer blower motor
6= temp feeler in engine room
7=outer temo feeler
8= potentiometer temperatur driver side
9=NC
10+,11+, for stepper motors
12+F21 (15)
13+ F21 (15)
14= ground
15=ground
16= potentiometer+ feeler ground
17= potentiometer flappers
18 temp feeler left
19 starter (50)
20=potentiometer+feed
21 temp feeler inside
22 temp feeler reight side
23+ for stepper motors
24+for stepper motors
25+26 = F21 (15)
26+ F21 (15)


X611 GN "B"
1 to 14,15,16
2,3,4,5 mixing flap motor left
6,7,8,9 fresh air stepper motor outside
10 NC
11 NC
12 NC
13 NC
14, 15,16 with pin 1 legroom stepper motor left
17, 18, 19, 20 defrost flap stepper motor
21, 22, 23 fresh air stepper motor left
25 NC
26 NC


X614 GE "D"
1,2,3,4 legroom stepper motor right
5 MPX button
6 MPX button left
7 MPX defrost
8 MPX button right
9 speed signal
10 RDX
11 button rear window defogger/defroster
12 MPX button recirculation
13 MPX button aircon
14, 15, 16, 17 fresh air stepper motor right
18, 19, 20, 21 mixing flap stepper motor right
22 NC
23 NC
24 NC
25 NC
26 NC

Plug is same as X501

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this table is more complete --
eventually will show end to end circuit runs -- for now only the next termination is listed
F = female, M = male
entries such as X1806- - are terminals, splices, or posts
some pins have two wires connected - so there are two entries
Type: Sv signal variable voltage, Sa signal variable current, Sp signal pulsed
Pc constant power, Ps switched power, Gc constant ground, Gs switched ground

Plug - Pin	Next Plug - Pin	Wire dia	Wire color	Type	Description
X1600-F-01	X1806- -	2.5	SW	Sp	IGNITION PULSE & FUEL PUMP RELAY CONTROL
X1600-F-02	X1620	2.5	BR	Gc	GROUND
X1600-F-03	X1600-F-37	0.5	BR GN	Ps	SWITCHED POWER IN FROM MAIN RELAY
X1600-F-03	X1537-F-07	0.5	BR GN GE	-	POWER TO TCU X2000
X1600-F-04	-	-	-	-	NO CONNECTION
X1600-F-05	X1818- -	0.5	BE GE WS	-	EVAPORATOR PURGE
X1600-F-06	X20-M-09	0.75	SW GE WS	-	ENGINE SPEED TO INSTRUMENTS
X1600-F-06	X1602-F-47	0.5	SW GE WS	-	ENGINE SPEED INPUT
X1600-F-07	X1610-F-06	0.5	GR BL GE	-	AIR MASS LOAD SIGNAL
X1600-F-08	X1612-F-01	0.5	SW	-	CYLINDER ID
X1600-F-09	-	-	-	-	NO CONNECTION
X1600-F-10	X1523-M-01	0.5	GE	-	GROUND, THRU OXY SENSOR
X1600-F-11	-	-	-	-	NO CONNECTION
X1600-F-12	-	-	-	-	NO CONNECTION
X1600-F-13	X1871- -	0.5	SW GE WS	-	DIAGNOSTIC LINK RXD
X1600-F-14	X1810- -	1.5	BR	-	GROUND
X1600-F-15	X1909- -	0.5	GR	-	GROUNDS THE CHECK ENGINE LIGHT !
X1600-F-16	X1804- -	1.5	BR WS GE	-	INJECTOR DRIVE
X1600-F-17	X1801- -	1.5	BR GE WS	-	INJECTOR DRIVE
X1600-F-18	X1822- -	0.5	RT GE WS	-	ALWAYS HOT FROM BATTERY THRU FUSIBLE LINK
X1600-F-19	X1811- -	1.5	BR	-	SHIELD GROUND
X1600-F-20	-	-	-	-	NO CONNECTION
X1600-F-21	-	-	-	-	NO CONNECTION
X1600-F-22	-	-	-	-	NO CONNECTION
X1600-F-23	X1609-F-04	0.5	BR SW GE	-	OXYGEN SENSOR HEATER
X1600-F-24	X1810- -	1.5	BR	-	GROUND
X1600-F-25	X1610-F-01	0.5	GR GE WS	-	AIR FLOW BURN-OFF
X1600-F-26	X1610-F-05	0.5	GR WS GE	-	AIR FLOW METER GROUND
X1600-F-27	X1601-F-27	5	GN GE WS	-	SWITCHED SUPPLY
X1600-F-27	X1827- -	1	GN GE WS	-	SWITCHED SUPPLY
X1600-F-28	X1523-M-03	0.5	SW	-	OXYGEN SENSOR SIGNAL
X1600-F-29	-	-	-	-	NO CONNECTION
X1600-F-30	-	-	-	-	NO CONNECTION
X1600-F-31	X1612-F-02	0.5	GE	-	CYLINDER ID
X1600-F-32	X20-M-03	0.5	WS GE WS	-	FUEL RATE SIGNAL
X1600-F-33	-	-	-	-	NO CONNECTION
X1600-F-34	-	-	-	-	NO CONNECTION
X1600-F-35	-	-	-	-	NO CONNECTION
X1600-F-36	X1605-F-04	0.5	BR GE WS	-	MAIN RELAY CONTROL
X1600-F-37	X1600-F-03	0.5	BR GN	-	POWER TO X1600-F-03
X1600-F-37	X1820- -	1.5	RT BL GE	-	POWER FROM MAIN RELAY CONTROL
X1600-F-38	X20-M-08	0.5	GN GE WS	-	ANTI THEFT
X1600-F-38	X1601-F-38	0.5	GN GE WS	-	DIAGNOTIC LINK
X1600-F-39	X1873- -	1.5	GN BL	-	DIAGNOSTIC LINK
X1600-F-40	-	-	-	-	NO CONNECTION (GROUNDED IN DME II)
X1600-F-41	-	-	-	-	NO CONNECTION
X1600-F-42	X1870- -	0.5	SW BR	-	P/N SWITCH
X1600-F-43	X1610-F-03	0.5	GR VI GE	-	CO ADJUST
X1600-F-44	X1616-F-02	0.5	GR GE WS	-	INTAKE AIR TEMP
X1600-F-45	X1622-F-01	0.5	BR RT GE	-	COOLANT TEMP
X1600-F-46	-	-	-	-	NO CONNECTION
X1600-F-47	X1614-F-01	0.5	SW	-	E SPEED SENSOR
X1600-F-48	X1614-F-02	0.5	GE	-	E SPEED SENSOR
X1600-F-49	-	-	-	-	NO CONNECTION
X1600-F-50	X69- -	0.5	GN SW GE	-	DME I TIMING CONTROL SIGNAL
X1600-F-51	X1537-F-01	0.5	BR OR GE	-	ECT
X1600-F-52	X1602-F-06	0.5	VI GN GE	-	CLOSED THROTTLE CONTROL
X1600-F-53	X1602-F-05	0.5	VI GE WS	-	FULL LOAD THROTTLE CONTROL
X1600-F-54	X1537-F-03	0.5	BL GE WS	-	ECT
X1600-F-55	X1872- -	0.5	BL WS	-	DIAGNOSTIC LINK TXD

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X501 OBC IV Pin-out

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Model	Chassis	Engine type	Year	Bosch part No.	Motronic version
318is	E30	M42/B18	90-91	0 261 200 175	Bosch Motronic M1.7
318i/is	E36	M42disa/B18	92-12/93	0 261 200 990	Bosch Motronic M1.7
318i/is	E36	M42disaII/B18	1/94-12/94	0 261 203 282	Bosch Motronic M1.7.2
318i/is/Ti	E36	M42/B18 DISA2	1/95→	0 261 203 282	Bosch Motronic 1.7.2 w/ EWS-II
318i/is/Ti	E36	M42/B18 DISA2	1/95→	0 261 203 357	Bosch Motronic 1.7.2 w/ EWS-II
318i/is/Ti	E36	M44/B19	96→	0 261 203 667	Bosch Motronic M5.2 (OBD-II)
Z3	E36	1.8L 8V (M44/B18)	96→	??	Bosch Motronic M1.7.3
Z3	E36	M44/B19	96→	0 261 203 667	Bosch Motronic M5.2 (OBD-II)
320i	E30	M20/B20 (129hp)	87-91	0 261 200 152	Bosch Motronic M1.1
320i	E30	M20/B20 (129hp)	87-91	0 261 200 172	Bosch Motronic M1.3
320iS	E30	S14/B20 (192hp)	87-89	0 261 200 087	Bosch Motronic ML3.1
325e/es	E30	M20/B27 (122hp)	9/84-12/86	0 261 200 027	Bosch Motronic Basic 1.0
325e/es	E30	M20/B27 (127hp)	1/87-9/87	0 261 200 154	Bosch Motronic M1.1
325i/ECE	E30	M20/B25 (171hp)	85-87	0 261 200 081	Bosch Motronic M1.0
325i/is/iX	E30	M20/B25 (170hp)	87-91	0 261 200 153	Bosch Motronic M1.1
325i/is/iX	E30	M20/B25 (170hp)	87-91	0 261 200 173	Bosch Motronic M1.3
325i/is/iX	E30	M20/B25 (170hp)	87-91	0 261 200 351	Bosch Motronic M1.3
325i/is/iX	E30	M20/B25 (170hp)	87-91	0 261 200 380	Bosch Motronic M1.3
325i/is/iX	E30	M20/B25 (170hp)	87-91	0 261 200 382	Bosch Motronic M1.3
325i/is/iX	E30	M20/B25 (170hp)	87-91	0 261 200 524	Bosch Motronic M1.3
325i/is/iX	E30	M20/B25 (170hp)	87-91	0 261 200 525	Bosch Motronic M1.3
325i/is/iX	E30	M20/B25 (170hp)	87-91	0 261 200 526	Bosch Motronic M1.3
M3	E30	S14/B23 (195hp)	86-08/89	0 261 200 071	Bosch Motronic M1. Motorsport
M3	E30	S14/B23 (215hp)	09/89-90	0 261 200 091	Bosch Motronic M1. Motorsport
M3 - Evo2	E30	S14/B23 (220hp)	88	0 261 200 090	Bosch Motronic M1.Motorsport
M3 - Evo3	E30	S14/B25 (238hp)	01/90-05/90	0 261 200 092	Bosch Motronic M1. Motorsport
325i/is	E36	M50/B25	thru 8/91	0 261 200 403	Bosch Motronic M3.1
325i/is	E36	M50/B25	9/91-8/92	0 261 200 402	Bosch Motronic M3.1
325i/is/ic	E36	M50tu/B25	9/92-12/94	0 261 200 413	Bosch Motronic M3.3.1
325i/is/ic	E36	M50tu/B25	1/95→	0 261 200 413	Bosch Motronic 3.3.1 w/ EWS-II
328i	E36	M52/B28	96→	??	Bosch Motronic S41.1 (OBD-II)
M3 - Euro	E36	S50/B30	93-95	0 261 203 075	Bosch Motronic M3.3
M3	E36	S50us/B30	thru 12/94	0 261 203 506	Bosch Motronic M3.3.1
M3	E36	S50us/B30	1/95→	0 261 200 413	Bosch Motronic 3.3.1 w/ EWS-II
M3	E36	S50us/B32	96→	??	Bosch Motronic S41.1 (OBD-II)
520i	E34	M20/B20 (129hp)	87-90	0 261 200 172	Bosch Motronic M1.3
525i	E34	M20/B25	87-90	0 261 200 173	Bosch Motronic M1.3
525i	E34	M20/B25	87-90	0 261 200 524	Bosch Motronic M1.3
525i	E34	M50/B25	thru 8/91	0 261 200 405	Bosch Motronic M3.1
525i/iT	E34	M50/B25	9/91-1/92	0 261 200 403	Bosch Motronic M3.1
525i/iT	E34	M50/B25	2/92-93	0 261 200 402	Bosch Motronic M3.1
525i/iT	E34	M50tu/B25	93-12/94	0 261 200 413	Bosch Motronic M3.3.1
525i/iT	E34	M50tu/B25	1/95→	0 261 200 413	Bosch Motronic M3.3.1 w/ EWS-II
528i	E39	M52/B28	96→	??	Bosch Motronic MS41.1 (OBD-II)
533i	E28	M30/B32	84	0 261 200 008	Bosch Motronic M1.0 Basic
528e	E28	M20/B27	9/84-12/86	0 261 200 027	Bosch Motronic M1.0 Basic
528e	E28	M20/B27	01/87-09/87	0 261 200 154	Bosch Motronic M1.1
535i/is	E28	M30/B34	85-87	0 261 200 059	Bosch Motronic M1.0 Adaptive (24 pin)
535i/is	E28	M30/B34	88	0 261 200 059	Bosch Motronic M1.0 Adaptive (28 pin)
535i/is	E28	M30/B34 (218hp)	85-87	0 261 200 061	Bosch Motronic M1.0
535i	E34	M30/B35	89-92	0 261 200 179	Bosch Motronic M1.3
530i	E34	M60/B30	3/93-8/94	0 261 200 404	Bosch Motronic M3.3
530i	E34	M60/B30	9/94-12/94	0 261 200 404	Bosch Motronic M3.3 w/ air pump
530i	E34	M60/B30	1/95-4/94	0 261 203 484	Bosch Motronic M3.3 w/ EWS-II
540i	E34	M60/B40	thru 12/94	0 261 200 404	Bosch Motronic M3.3
540i	E34	M60/B40	1/95→	0 261 203 484	Bosch Motronic M3.3 w/ EWS-II
540i	E39	M62/B44	96→	0 261 203 474	Bosch Motronic M5.2 (OBD-II)
M5/M635CSI	E28/E24	S38/B35 (260hp kat)	87-88	0 261 200 079	Bosch Motronic M1.0 Motorsport
M5/M635CSI	E28/E24	M88 (286hp)	84-87	0 261 200 055	Bosch Motronic M1.0 Motorsport
M5	E34	S38/B36 (315hp)	91→	0 261 200 350	Bosch Motronic M1.2
633csi	E24	M30/B32	84	0 261 200 008	Bosch Motronic M1.0 Basic
635csi	E24	M30/B34	85-87	0 261 200 059	Bosch Motronic M1.0 Adaptive
635csi	E24	M30/B35	86-88	0 261 200 150	Bosch Motronic M1.1
635csi	E24	M30/B35	89	0 261 200 179	Bosch Motronic M1.3
730i	E32	M30/B30	89-92	0 261 200 178	Bosch Motronic M1.3
733i	E23	M30/B32	84	0 261 200 008	Bosch Motronic M1.0 Basic
735i	E23	M30/B35	09/80-09/82	0 261 200 001	Bosch Motronic M1.0 Basic
735i	E23	M30/B34 (218hp)	84-87	0 261 200 011	Bosch Motronic M1.0 Adaptive
735i	E23	M30/B34	84-87	0 261 200 059	Bosch Motronic M1.0 Adaptive
735i/iL	E32	M30/B35	86-88	0 261 200 150	Bosch Motronic M1.1
735i/iL	E32	M30/B35 (211hp)	89-92	0 261 200 179	Bosch Motronic M1.3
740i/iL	E32	M60/B40	9/92-4/94	0 261 200 404	Bosch Motronic M3.3
740i/iL	E38	M60/B40	1/95→	0 261 203 484	Bosch Motronic M3.3 w/ EWS-II
740i/IL	E38	M62/B44	96→	0 261 203 474	Bosch Motronic M5.2 (OBD-II)
745i	E23	M102/B34 (252hp)	83--86>	0 261 200 013	Bosch Motronic M1.0
750iL	E32	M70/B50	88-90	0 261 200 156	Bosch Motronic M1.2
750iL	E32	M70/B50	91→	0 261 200 352	Bosch Motronic M1.7
750iL	E38	M73/B54	9/94→	0 261 203 473	Bosch Motronic M5.2 (OBD-II)
840i	E31	M60/B40	9/93-12/94	0 261 200 404	Bosch Motronic M3.3
840i	E31	M60/B40	1/95→	0 261 203 484	Bosch Motronic M3.3 w/ EWS-II
840i	E31	M62/B44	96→	0 261 203 474	Bosch Motronic M5.2 (OBD-II)
850i	E31	M70/B50	91→	0 261 200 352	Bosch Motronic M1.7
535i/Alpina B9	E28	M30/B34 (245hp)	85-87	0 261 200 011	M1.0
Alpina B7Turbo	E24	M30 (300hp)	85-87	0 261 200 043	M1.0
Alpina B7 Turbo Coupe	E24	M30 (330hp)	85-87	0 261 200 043	M1.0
Alpina B7 Turbo Kat.	E24	M30 (320hp)	85-87	0 261 200 079	M1.0
Alpina B10	Biturbo E34	M30 (360hp)	89-94	0 261 200 079	M1.1

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ARTICLE BEGINNING 1990 ELECTRICAL Alternators & Regulators taken from an article for Audi



SYSTEM DESCRIPTION Bosch alternators are conventional 3-phase, self-rectifying type alternators. Bosch 110-amp alternators use 14 diodes. See Fig. 1. All alternators use 3 exciter diodes connected to stator windings.
These diodes turn off the alternator indicator light and supply power to the voltage regulator while the engine is running. Bosch regulators are transistorized and integal with alternator.

WIRING CONTINUITY TEST
1) Connect a voltmeter between alternator Red battery terminal wire and ground. Voltmeter should indicate battery voltage. If not, check wiring between alternator and battery.
2) Turn ignition on. Ensure alternator indicator light comes on. If light does not come on, check wiring between alternator and warning light, including indicator bulb.

ALTERNATOR EXCITER CIRCUIT TEST

CURRENT CHECKING Check that battery voltage is a minimum of 12 volts. Charge as needed. Disconnect Blue wire from alternator terminal and connect Multimeter (US 1119) between alternator terminal and Blue wire. Set multimeter to 200-mA range. If reading is lower than 150-185 mA, check Blue wire between alternator and instrument panel or replace printed circuit in instrument cluster.

RESISTANCE CHECKING
Disconnect negative battery cable. Disconnect Blue wire terminal of alternator. Connect Multimeter (US 1119) between Blue wire and battery positive. Turn ignition on. If readings is not 140-160 ohms, replace instrument cluster printed circuit and recheck. Fig. 1: Exploded View of Bosch 110-Amp Alternator

OUTPUT CHECK
1) Ensure connections at battery, alternator and starter are clean and tight. Ensure alternator, engine and body are properly grounded. Ensure alternator drive belt is tight and in good condition.
2) Connect Ammeter/Voltmeter (VAT-40/60) or equivalent, following manufacturer's instructions. Connect voltmeter leads to battery terminals. Connect Green clamp (ammeter inductive pick-up) to alternator Brown/Yellow wire to battery (positive post). Start engine and allow to idle. Alternator output should be 20-30 amps.
3) Repeat test at 2000 RPM. Alternator output should be 90-110 amps or within 10 percent of manufacturer's specification. If alternator output is low, remove alternator for testing and repairs.
If reading is 16-20 amps less than alternator rating, replace regulator and retest. If output is still low, repair or replace alternator.

DIODE ASSEMBLY BENCH TESTING
1) Place ohmmeter on x100 scale. Connect ohmmeter leads across B+ terminal and each of the 3 stator terminals, in turn. Reverse leads. Ohmmeter should indicate continuity in one direction only.
2) Connect ohmmeter leads across negative plate and each of the 3 stator terminals, in turn. See Fig. 2. Reverse leads. Ohmmeter should indicate continuity in one direction only. Fig. 2: Testing Bosch Diode Assembly
3) Connect ohmmeter leads across D+ terminal and each of the 3 stator terminals, in turn. Reverse leads. Ohmmeter should indicate continuity in one direction only. Replace diode assembly if defective.

STATOR BENCH TESTING
1) Place ohmmeter on lowest scale. Connect ohmmeter across stator leads. Resistance between leads should be approximately .09-.10 ohm. If resistance is incorrect, stator has open or shorted windings and must be replaced.
2) Place ohmmeter on x1000 scale. Connect ohmmeter between stator core and stator lead. No continuity should exist. If continuity exists, stator is grounded and must be replaced.

ROTOR BENCH TESTING
1) Place ohmmeter on lowest scale. Connect ohmmeter across slip rings. Resistance should be 2.8-3.1 ohms.
2) If resistance is too low, rotor has short circuit and must be replaced. If resistance is infinity (no continuity), rotor has open circuit and must be replaced.
3) Place ohmmeter on x1000 scale. Connect ohmmeter between either slip ring and rotor core. No continuity should exist. If continuity exists, rotor is grounded and must be replaced.
4) Clean slip rings using fine sandpaper. Rings which are worn or pitted should be turned on lathe. Minimum ring diameter is 1 1/16" (27 mm).
5) If slip rings are beyond repair, remove rear bearing from slip ring end of rotor. Unsolder wires from slip rings and bend up ends of rotor winding. Pull off slip rings. Ensure ends of rotor winding are not damaged.
6) Insert ends of rotor winding into slip ring and press new slip ring onto rotor. Slip ring end must be 9/64" (3.57 mm) from end of collar. Solder rotor winding to slip ring terminals. Turn rings on lathe and retest rotor. Maximum slip ring run-out is .0012" (.03 mm).

BEARINGS BENCH TESTING
Always replace bearings when overhauling alternator. If replacement front bearing is sealed on one side only, open side must face rotor. If replacement rear bearing is sealed on one side only, open side must face away from rotor.

BRUSHES BENCH TESTING
Ensure brushes are longer than 7/32" (5.56 mm). Replace if necessary. Unsolder brushes from voltage regulator. Solder new brushes. Do not allow solder to run into strands of brush leads. Brushes must be free to slide in brush holder with normal spring tension of 10-14 ozs. (283-397 g). see also here

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