B1195
Symptom: ABS (ANTI LOCK) warning lamp on, no ABS function.
Main relay circuit, faulty
Fault symptom
ABS (ANTI LOCK) warning lamp on, no ABS function.
Condition
The trouble code is generated when the ignition is switched on and the subsequent test
is performed if battery voltage is less than 5 V for longer than 30 seconds, or while the car is
being driven if battery voltage is less than 5 V for longer than 20 milliseconds.
Diagnostic help
A reading of the control module's power supply (+30 circuit) can be obtained with
the ISAT scan tool.
- Select ”READ VALUES”.
- Select ”BATTERY VOLTAGE”.
The current battery voltage will be displayed. If the +15 circuit is not connected to the
control module, perhaps because fuse 19 has blown, no communication will be
established.
Diagnostic procedure
1 Check the fuses
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•
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current is supplied to fuse 22
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-
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Connect the test lamp to fuse 22 and a good
grounding point.
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Fuse inspection OK?
Continue with point 2.
Rectify the fault and if necessary continue fault diagnosis as described in
Service Manual 3:2 Electrical system, +30 power supply.
2 Check the battery
-
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Check the condition of the battery. See Service
Manual 3:1, Electrical system, Battery
.
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Is the condition of the battery OK?
Continue with point 2.
Rectify the fault.
3 Check the control module's power supply and connection to
ground
-
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Unplug the control module's 4-pin
connector.
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-
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Ignition switch in ON position.
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-
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Take voltage readings on the control module's
connector:
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•
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pin 1 to battery positive (B+)
<0.5
|
•
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pin 2 to battery positive (B+) <0.5
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•
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pin 3 to battery negative (B-) <0.1 V
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Are all voltage readings OK?
Continue with point 3.
Check the wiring, including connectors and grounding point G30. Rectify if
necessary.
4 Final check
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Clear the diagnostic trouble code.
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Drive the car at varying engine loads and rpm for 5 minutes.
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-
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Read the diagnostic trouble code.
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Is the diagnostic trouble code stored?
Continue with
The diagnostic procedure carried out was correct or the fault is of an
intermittent nature.