DRBII Diagnostic Read-Out Box
The DRBII is a diagnostic read-out box designed by Chrysler to gain access to the on-board diagnostics that are found on Chrysler-built cars and trucks.- The DRBII reads the system performance information that is stored in the vehicle system controllers.
- The DRBII displays the fault messages that have been stored in the various system controller memories.
- The DRBII allows the Technician to run tests of computer-controlled vehicle systems.
- The DRBII, along with the test instructions in this section, leads the Technician through the diagnostic procedures.
There are diagnostic read-out boxes available from other manufacturers that can be used on Chrysler vehicles. However, the diagnostic test procedures in this manual have been designed specifically for use with Chrysler's DRBII diagnostic read-out box. It is assumed that the DRBII will be used to perform the procedures in this section.
The DRBII operates by communicating with the controller for the vehicle system being tested. To communicate with any body system controller, the DRBII must be connected to the CCD bus diagnostic connector.
To perform the diagnostic tests in this section, a program cartridge must be inserted into the DRBII. This cartridge serves a similar purpose for the DRBII as a diskette does for a personal computer. It contains the diagnostic test program. It must be inserted into the DRBII in order to perform the tests in this section.
DRBII TEST FUNCTIONS
This section contains diagnostic tests for the following body Systems:
^ Electronic Vehicle Information Center (EVIC)
^ Electronic Instrument Cluster (EIC)
^ Mechanical Instrument Cluster (MIC)
^ Vehicle Theft Alarm
^ Traveler
^ Compass/Temperature Module
^ Headlamp doors
^ Automatic door locks
^ Intermittent wipers
^ Illuminated entry
^ Courtesy lamps.
In order to perform the tests, you must operate the DRBII to reach the module menu level within the diagnostic testing program. At the module menu, you can read DRBII faults and perform diagnostic test functions.
The module menu provides a choice of several different categories of test functions as described below.
System Tests - This function Enables the technician to determine whether the engine controller is active over the CCD bus.
Read Faults - This function enables the technician to read faults.
State Display - This function enables the technician to read the states or values of a variety of sensors, inputs/outputs, and components.
Actuator Tests - This function enables the technician to activate various outputs, motors, and relays to test their operation.
Adjustments - This function enables the technician to change the vehicle theft alarm system mode from disarmed to armed, or to put the alarm system in the self-diagnostics mode. This function is not available for testing of any other body modules.
A DIAGNOSTIC TEST PROCEDURE IS:
- A systematic method of checking the functioning of a vehicle control system to determine if it is operating normally.
- A systematic method of analyzing and testing a vehicle control system to determine the source of a malfunction.
GUIDELINES FOR PERFORMING DIAGNOSTIC TEST PROCEDURES
All test procedures assume that Chrysler's DRBII diagnostic read-out box is being used.
To properly perform diagnostic testing of body systems using the test procedures, ALWAYS start with Test 1A. Starting with any other test may result in incorrect fault diagnosis.
^ Make sure the vehicle being tested has a fully charged battery.
^ Perform a visual inspection of the connectors and wiring of the circuit being worked on prior to beginning a diagnostic test.
^ The tests are presented in modified flowchart form.
- The first two columns contain instruction statements. Perform each instruction in order. Perform each instruction as stated.
- The third column contains diagnostic questions. Answer each question with a "yes" or "no" answer.
- The fourth column contains repair or replacement instructions. Perform only the repair replacement instruction(s) that follow from the "yes" or "no" answer to each question.
- To proceed from one process box to another, follow the direction of the lines between the boxes as indicated by the arrows.
- If a test is continued, an instruction is given in an arrow-shaped "box" to direct you to the next page or to another test.
NOTE: Tests are identified by a number/letter combination, such as Test 1A or Test 5C. To avoid confusion between the number 1 and the letter "I" and between the number 0 and the letter "0", no test identifications use the letters "I" or "0".
^ When testing voltage or continuity at a body system module, use the terminal side (not the wire end) of the connector. Probing a wire through the insulation will damage it and eventually cause it to fail because of corrosion.
^ Be careful when performing electrical tests so as to prevent accidental shorting of terminals. Such mistakes can damage fuses or components. Also, a second fault message could be set, making diagnosis of the original problem more difficult.
^ Use the DRBII voltmeter unless otherwise instructed to use an "external" voltmeter.
NOTE: Under no circumstances should a test lamp be used in place of a voltmeter.
^ Use the DRBII ohmmeter unless otherwise instructed to use an "external" ohmmeter. After each repair is completed, perform the Verification Test procedure (Test 84A).