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| Title: | Cars in the UK |
| Notice: | Please read new conference charter 1.70 |
| Moderator: | COMICS::SHELLEY ELD |
|
| Created: | Sun Mar 06 1994 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2584 |
| Total number of notes: | 63384 |
2499.0. "BMW service lights reset" by UNITED::RENCONTRE (Les, CTS, UK) Thu Mar 07 1996 14:11
Extract from: http://cbsgi1.bu.edu/bmw/sil.html
The Service Indicator Lights
The BMW service indicator lights are considered by many to be totally
useless for indicating when you should service the car. The cheapest,
ugliest solution for turning off the service light is to cover them up
with black tape. If you want to be more adventurous, you can remove the
instrument cluster and cut the wire going to the lights. True motorheads
will read on though.
The service indicator lights are reset through a pin in the diagnostic
connector located in the engine compartment. There are 2 types of
diagnostic connectors used on BMWs. One is a 15 pin connector used on
1987 and earlier cars, the other is a 20 pin connector used on 1987-on
cars. In what follows the 15 pin connector is referred to as the early
type and the 20 pin as the late type. Resetting the service indicator
lights is described below. The most common problem with resetting the
service lights is bad NiCad batteries in the instrument cluster. The
batteries seem to fail pretty consistently after 4 years. The symptoms
of this are:
1. The inspection light comes on.
2. Resetting the light according to the instructions below either
doesn't work or works for a short period of time and then the inspection
light comes back on.
Relevant Roundel references:
The Roundel is the monthly publication of the BMW Car Club of America
BMW CCA.
Jan 1992, Nov 1991, Dec 1989, May 1988 -- Resetting the service
indicator lights
Late type connector:
The service indicator lights are reset by connecting pin 7 to pin
19(ground). The proper way to do this is to have the ignition off and
place a jumper wire between pins 7 and 19 (make sure you get the right
pins!). Then turn the ignition switch to position 2 (run, NOT start),
when the service light goes out, turn the ignition off. This should
take a few seconds for an oil reset, 8-10 seconds for an inspection reset.
All green lights should come on when the service light goes out. The
difference between resetting the oil service light and the inspection
light is in the length of time you have the jumper in place with the
ignition on. This means that if you are resetting the oil service light,
you should turn off the ignition immediately after the light goes out.
If you leave the jumper in too long with the ignition on, you will perform
an inspection reset as well and the next service indicator will come up
as an oil service rather than an inspection.
The service light reset tools that I have seen connect to 3 pins of the
diagnostic connector: pin 7,14 and 19. The connection to 14 is to power
the tool. The less sophisticated tool has only one switch that connects
pin 7 to 19. While those pins are tied together a red LED blinks to
measure time. You count blinks and manually turn off the tool after the
appropriate number of counts for oil or inspection reset. The more
sophisticated tool has two switches, one for oil reset, one for inspection.
It must have a built in timer that jumps pin 7 to 19 for the correct time.
Notes on the latest model cars (93 on?):
(can someone please verify this?) It is claimed that the above procedure
doesnt quite work on the most recent model year cars. Instead of waiting
for the lights to go out, you have to disconnect the jumper between 7
and 19 while the ignition is still on.
Early type connector:
The procedure is the same as above, but you jumper pin 7 (the service
indicator pin) to pin 1 (the ground pin).
The early type connector:
*******
**** ****
*** (10) ***
** (9) (11) ***
* *
* (2) *
* (8) (3) *
* *
* (7) *
* (1) *
* (4) *
* *
* (6) *
* (15) (5) *
* *
** (14) (12) ***
*** (13) ***
**** ****
*******
Diagnosis plug connections:
No. Terminal Designation
1 31 Ground
2 - -
3 - -
4 FT Temperature gauge
5 L Engin M10B18 Interfrator output for CO adjustment
Engin M30B34 Oxygen Sensor signal
6 A Diagnosis lead for SRS
7 SI Service indicator
8 P+ Position sender
9 S Shielding
10 P- Position sender
11 50 Starting pulse for starter
12 61 Alternator charge indicator
13 1 Ignition signal
14 30 battery +
15 15 Power supply for ignition
The late type connector:
** ***
**** ***** ****
*** (1) ***
** (12) (2) ***
* *
* (11) (20) (13) (3) *
* *
* (10) (19) (14) (4) *
* *
* (15) *
* (9) (18) (5) *
* (16) *
* (17) *
** (8) (6) **
** ***
*** (7) ***
**** ****
*******
From the BMW NA 1989 Electrical Troubleshooting Manual for the
325i/iS:
Pin Wire Size Wire Color Circuit and Component Connected
1 1 BK Ignition Coil, Motronic Control Unit
6 0.5 WT/BK SRS Connector (Not Used)
7 0.5 WT/GN Service Interval Indicator, Service Interval
Processor(Reset).
11 2.5 BK/YL Starter, Start Signal(50)
12 0.75 BU Charge, Alternator(D+)
14 2.5 RD Battery
15 0.5 WT/YL Motronic Control Unit(RXD)
16 1.5 GN/WT Oxygen Sensor
18 0.5 GN/BU Motronic Control Unit(Programming Voltage)
19 1.5BR BR Ground Distribution(G103)
20 0.5 WT/VI Motronic Control Unit(TXD)
---------------------------------------------------------------------------
The Dummy plug.
Late models:
The cap on the diagnostic connector is actually an electrical connector
that shorts together the following pins:
--pins 18 and 20 to pin 19.
--pin 14 to 15.
Other things you can do with the diagnostic connector.
(I've never tried any of these!!!:)
Remote Starter: Connecting a remote starter switch to pins 11 and 14
will
allow you to start the engine or "bump" it into position for valve
adjusting.
Read O2 sensor: ???
Motronic faults: ???
---------------------------------------------------------------------------
| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 2499.1 | | CBHVAX::CBH | Owl-Stretching Time! | Thu Mar 07 1996 14:48 | 5 |
| >True motorheads will read on though.
didn't know that Lemmy read this conference! :)
Chris.
|
| 2499.2 | | CHEFS::BRIGGS_R | they use computers don't they | Fri Mar 08 1996 09:31 | 4 |
|
See also note 421 re my experiences 8-9 years ago.
Richard
|