TK 61753-2-MM-EN
15
Low Voltage
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Microprocessor Service Precautions
Take precautions to prevent electrostatic discharge when servicing the microprocessor and its related components.
Even tiny amounts of current can severely damage or destroy electronic components.
Observe the following precautions when servicing a microprocessor control system to avoid damaging electronic
components. Refer to the appropriate microprocessor diagnosis manual for more information.
• If the microprocessor has a power switch, turn it OFF before connecting or disconnecting the battery.
• Disconnect power to the unit.
• Avoid wearing clothing that generates static electricity (wool, nylon, polyester, etc.).
• Wear a wrist strap (P/N 204-622 or equivalent) with the lead end connected to the microprocessor’s ground terminal.
These straps are available from most electronic equipment distributors. DO NOT wear these straps with power
applied to the unit.
• Avoid unnecessary contact with the electronic components.
• Store and ship electronic components in antistatic bags and protective packaging.
• Leave electronic components in their antistatic packing materials until you’re ready to use them.
• After servicing any electronic components, check the wiring for possible errors before restoring power to the unit.
• Never use a battery and a light bulb to test circuits on any microprocessor-based equipment.
Welding Precautions
Take precautions before electrically welding any portion of the unit or the vehicle to which it is attached. Verify that
welding currents are not allowed to flow through the unit’s electronic circuits.
Observe the following precautions when welding to avoid damaging electronic components.
• If the microprocessor has a power switch, turn it OFF before connecting or disconnecting the battery.
• Disconnect power to the unit.
• Disconnect all wire harnesses from the microprocessor. Disconnect the ECU and the battery charger if so equipped.
• Disconnect the DCDC converter.
• If there are any electrical circuit breakers in the control box, switch them OFF.
• Close the control box.
• Components that could be damaged by welding sparks should be removed from the unit.
• Use normal welding procedures, but keep the ground return electrode as close to the area being welded as
practical. This will reduce the likelihood of stray welding currents passing through any electronic circuits.
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