Scan Tool Testing and Procedures

Using the DRB
Refer to the DRB user's guide for instructions and assistance with reading trouble codes, erasing trouble codes, and other DRB functions. The Entry Module and Airbag Control Module all communicate with the DRB for ease of diagnosis.

DRBIII Safety Information

WARNING: Exceeding the limits of the DRB multimeter is dangerous. It can expose you to serious or possibly fatal injury. Carefully read and understand the cautions and the specification limits.
- Follow the vehicle manufacturer's service specifications at all times.
- Do not use the DRB if it has been damaged.
- Do not use the test leads if the insulation is damaged or if metal is exposed.
- To avoid electrical shock, do not touch the test leads, tips, or the circuit being tested. Choose the proper range and function for the measurement. Do not try voltage or current measurements that may exceed the rated capacity.





- Do not exceed the limits shown in the table.
- Ohms cannot be measured if voltage is present. Ohms can be measured only in a non-powered circuit.
- Voltage between any terminal and ground must not exceed 500v DC or 500v peak AC.
- Use caution when measuring voltage above 25v DC or 25v AC.
- The circuit being tested must be protected by a 1OA fuse or circuit breaker.
- Use the low current shunt to measure circuits up to 10A. Use the high current clamp to measure circuits exceeding 10A.
- When testing for the presence of voltage or current, make sure the meter is functioning correctly. Take a reading of a known voltage or current before accepting a zero reading.
- When measuring current, connect the meter in series with the load.
- Disconnect the live test lead before disconnecting the common test lead.
- When using the meter function, keep the DRB away form spark plug or coil wires to avoid measuring error form outside interference.

DRB III Error Messages and Blank Screen
Under normal operation, the DRB will display one of only two error messages:
- User-Requested WARM Boot or User-Re quested COLD Boot

DRB III Error Message Sample:

If the DRB should display any other error message, record the entire display and call the MDS Hotline, or call for information and assistance at 1-800-825-8737. The image shows a sample of such an error message display.

DRBIII Does Not Power Up
If the LED's do not light or no sound is emitted at start up, check for loose cable connections or a bad cable. Check the vehicle battery voltage (data link connector cavity 16). A minimum of 11 volts is required to adequately power the DRB.

If all connections are proper between the DRB and the vehicle or other devices, and the vehicle battery is fully charged, an inoperative DRB may be the result of faulty cable or vehicle wiring.

Perform Vehicle Communication TEST 1A.





Display is Not Visible
Low temperatures may affect the visibility of the display. Adjust the contrast to compensate for this condition.