Diagnostic Precautions

Prior To Fault-tracing/Repair








- Make a note of radio code if anti-theft coded radio installed.
- Ignition off.
- Disconnect battery negative lead.

The ignition should be switched off and the battery negative lead disconnected, before any of the following are carried out:
^ Installing or removing special tool 998 8695.
^ Connection or disconnection of connectors and cabling.
^ Connection or disconnection of airbag modules, seat belt tensioners or sensor module.
^ Installing or removing SRS components.
^ Taking readings with an ohmmeter.

During Fault-tracing/Repair





WARNING: Unless otherwise stated, the ignition should be switched off and the negative battery lead disconnected while work on the SRS system is being undertaken. Carefully follow instructions step by step to avoid accidental deployment or damage. Take great care to avoid injury.

Unless otherwise stated in instructions, special tool 998 8695 should be connected when an airbag or seat belt tensioner has been removed. If the SRS system is connected to supply voltage when an airbag or seat belt tensioner has been removed (and the special tool is not connected), a diagnostic trouble code (DTC) will be posted.








After fault-tracing/repair - When all components have been reinstalled.
- Switch ignition to position II.
- Connect battery negative lead.

WARNING: Ensure that nobody is in the car when the battery is being connected.









Battery
- It is important that supply voltage is normal (approx. 12 V) when testing components in the car. If necessary, a battery charger can be connected during testing.

- Connect battery charger to the battery terminals. Charge battery for approx. 10 hours at the recommended current -maximum 6 A.

Example: If the battery is marked 520 A a charge current of 0.01 x 520 = 5.2 A is recommended.

A higher than recommended charging current can damage the battery.

CAUTION: Boost charging (with a high current or voltage above 16 V) will damage the battery and is prohibited.

WARNING: While the battery is being charged an explosive mixture of oxygen and hydrogen gases is formed. Smoking, welding, grinding or other activities involving sparks or naked flames are prohibited in the vicinity of a charging battery. Batteries must be charged in a well ventilated area.




Fire risk

WARNING: Avoid creating sparks when working on the fuel injection system, especially when inspecting the injectors.




High Voltages

WARNING: The ignition system operates at high power and voltages. It is dangerous to come in contact with the high tension circuit - the ignition coil, spark plug caps and distributor cap.




Connecting And Disconnecting The Control Module
The ignition must be off and the battery negative terminal disconnected when connecting and disconnecting the SRS sensor module.




Control Modules
- Control modules must not be heated to above +80°C. Remove control modules when stoving new paintwork for example.
- Do not replace a control module without first inspecting cabling and components. Otherwise the new control module could be damaged in the same way as the old one.








When Arc-Welding
- The ignition must be off and the battery negative terminal disconnected when welding.
This is to prevent a closed circuit.
- Position the welding ground as close to the welding site as possible, otherwise different ground potentials could be generated in different components.
- When arc-welding close to electronic modules the module must be removed to avoid heat damage.