1989 BMW M3 Electrical Troubleshooting Manual

Short Test Using Ohmmeter
Disconennect the battery adjust the ohmmeter to read zero while holding the leads together. Remove the blown fuse and disconnectthe load. Connect one lead of the ohmmeter to the fuse terminal that is closest to the load. Connect the other lead to a known good ground.
Starting near the POWER DISTRIBUTION BOX, move the wire harness back and forth and watch the ohmmeter reading. Low or no resistance indicates a short to ground in the wiring. Infinitely high resistance indicates no short.

CONTENTS
Index
How to use this manual
Wire size conversion chart
Symbols
Systematic Troubleshooting
Connector Views
Power Distribution Box
Fuse Data
Component Location Chart
Component Location Viewa
Splice Location Views
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1990 BMW M3 Electrical Troubleshooting Manual

The purpose of this manual is to show electrical schematics in a manner that makes electrical troubleshooting easier.
Electrical components which waork together are shown together on one schematic.
The wiper-washer schematic, for example, shows all of the electrical components in one diagram. At the top of the page is the fuse (positive) that powers the circuit.
The flow of current is shown through all wires, connectors, switches, and motors to ground (negative) at the bottom the page

CONTENTS
Index
How to use this manual
Wire size conversion chart
Symbols
Systematic Troubleshooting
Connector Views
Power Distribution Box
Fuse Data
Component Location Chart
Component Location Viewa
Splice Location Views
Please Download Here

Read More ->>

1991 BMW 325i Electrical Troubleshooting Manual

Troubleshooting Procedure

1. Verify the Problem
Operate the problem circuit to check the accuracy of the complaint.
Note the symptoms of the inoperative circuit.

2. Analyze the Problem
Refer to the schematic of the problem circuit in the ETM.
Determine how the circuit is suspposed to work by tracing the current path(s) from the power feed through the circuit components to ground.
Then based on the symptoms you note in step 1 and your understanding of circuit operation, identify one or more possible causes of the problem.

3. Isolate the Problem
Make circuit tests to prove or disprove the preliminary diagnosis made in step 2.
Keep in mind that a logical simple procedure is the key to afficient troubleshooting.
Test for the most likely cause of failure first.
Try to make tests at points which are easily accessible.

4. Repair the Problem
Once the specific problem is identified. make the repair using the proper tools and safe procedures.

5. Check the Problem
Operate the circuit to check for satisfactory circuit operation. Good repair practice calls for rechecking all circuit you have worked on.

Contents
Index
How to use this manual
Wire size conversion chart
Symbol
Systematic troubleshooting
Connector views
Power distribution box
Fuse data
Component location chart
Component location views
Splice location views
Please Download Here

Read More ->>