Diagnostic Test Procedures
Diagnostic ProceduresA 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 an air bag code.
Guidelines for Performing Diagnostic Test Procedures
Always use the most current diagnostic program cartridge available in order to prevent getting erroneous codes or test results.
All test procedures assume that Chrysler's DRBII diagnostic read-out box is being used.
Refer to HELP 1 - Operation of the DRBII for Diagnostic Testing for instructions on connecting the DRBII to the diagnostic connector and instructions on how to get to the diagnostic program tests. Help 1: Operation Of The DRBII For Diagnostic Testing
Refer to the "DRBII Functional Flow Diagram" inside the front cover of this section for an illustration of the DRBII diagnostic program.
To properly perform diagnostic testing of the air bag system using the test procedures in this section, ALWAYS start with Test 1A. Starting with any other test may result in incorrect code diagnosis.
Make sure the vehicle being tested has a fully charged battery.
Review HELP 5 - Safety Instructions before performing the test procedures in this section. Help 5: Safety Instructions
Perform a visual inspection of the connectors and wiring of the circuit being worked on prior to beginning a diagnostic test. For information refer to "Visual Inspection" found earlier in this section, and to HELP 3 - Visual Inspection of Electrical Connectors. Help 3: Inspection of Electrical Connectors
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 NS-1A or Test NS-5C. To avoid confusion between the number 1 and the letter "I" and between the number 0 and the letter "O" no test identifications use the letters "I" or "O".
� When testing voltage or continuity at the Air Bag System Diagnostic Module, use the terminal side (not the wire end) of the connector. Do not probe a wire through the insulation; this 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 code 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 VER-1A). Verification Test VER-1A - Air Bag