Section 12M Supplemental Restraint System …

1 Techline Section 12M - Supplemental Restraint . System (VERSIONS AND ). IMPORTANT. Before performing any Service Operation or other procedure described in this Section , refer to Section 00 CAUTIONS AND NOTES for correct workshop practices with regard to safety and/or property damage. 1. GENERAL INFORMATION. The Supplemental Restraint System (SRS) used on VX Series Models carries over from the systems that were introduced for VT Series Models in August 1998; versions and , noting the following: Since the introduction of SRS versions and , there have been numerous changes and corrections: Introduction of the GEN III V8 engine, resulting in a new PCM (from VT Series II).

2 Introduction of a new PCM for vehicles with a V6 engine on VX Series Models. Minor changes to the side air bag wiring circuits terminal assignment of connector YB205 being swapped around (from VT Series II). Incorrect identification of the wire colour for circuit 1220 (from introduction of VT Series). Emittance of recognition of a shorting link busbar in connector YB189 (from VT Series II). These changes and corrections do not effect the SRS Operation or Service Operations, however, to avoid any confusion, the Diagnostic Charts for SRS versions and have been updated and republished in full in this Section .

3 The following table summarises the version usage on VX Series Models. SDM Pre-tensioner Driver's Air bag bag Side Air bags .. (SDM Sensing and Diagnostic Module). NOTE: Refer to the latest sales information for Model Option availability. For all information relating to the SRS used on VX Series Models that is not covered in this Section , refer to: Section 12M Supplemental Restraint System (Version ) or Section 12M Supplemental Restraint System (Version & ) of the VT Series I Service Information. NOTE: Information in these two Sections should be read in conjunction with each other.

4 2. DIAGNOSTICS. BASIC KNOWLEDGE REQUIRED. Refer to Section 12M Supplemental Restraint System (Version & ) of the VT Series I Service Information. PRELIMINARY System DIAGNOSIS. When investigating any complaint of an SRS problem or malfunction, always begin diagnosis with a circuit check, refer to DIAGNOSTICS CHARTS, CHART A - DIAGNOSTIC CIRCUIT CHECK in this Section . The diagnostic circuit check is a preliminary procedure that checks to ensure the SDM is communicating on the serial data line as well as helping to identify the problem and directing the technician to the appropriate diagnostic chart in this Section .

5 SRS SELF DIAGNOSIS. Refer to Section 12M Supplemental Restraint System (Version & ) of the VT Series I Service Information. TECH 2 DIAGNOSTICS, TEST MODES AND DISPLAYS FOR SRS DIAGNOSIS. All information relating to TECH 2, in regards to the SRS for VX Series Models, is as detailed in Section 12M Supplemental Restraint System (Version & ) of the VT Series I Service Information, noting the following: When using TECH 2 on a VX Series Model, ensure the correct Model Year and Vehicle Type is selected: (Y) 2000. (1) 2001 VX Commodore (2) 2002. Techline DIAGNOSTIC CHARTS. The following diagnostic charts are designed to provide fast and efficient fault location of the SRS for vehicles fitted with an or SDM only.

6 The diagnostic charts contain: a diagnostic chart', pertinent information, circuit diagrams, and where necessary, the steps are explained by the corresponding numbered paragraphs. Figure 12M-2 illustrates the correct use and installation of the various SRS diagnostic service tools (SD28280B &. AU485) and test lead set (KM-609-20) which are called up in the various diagnostic charts. Figure 12M-3 illustrates the terminal layout of the various connectors used in the and systems. This illustration should be used in conjunction with the diagnostic chart circuit diagrams when checking circuit faults if a connector diagram is not included in the chart.

7 IMPORTANT: UNDER NO CIRCUMSTANCES IS 12 VOLTS TO BE APPLIED TO THE DUMMY LOAD;. SD28280B OR AU485, AS THIS WILL DAMAGE THE INTERNAL RESISTOR IN THE LOAD, RENDERING THE. DUMMY LOAD USELESS FOR ANY FURTHER DIAGNOSTIC WORK. ENSURE THAT AT THE COMPLETION OF ANY DIAGNOSTIC PROCEDURE, ALL DIAGNOSTIC TOOLS ARE. REMOVED AND ALL SRS COMPONENTS ARE CORRECTLY RECONNECTED. When carrying out wiring checks as directed to by the diagnostic charts, rather than probe terminals and connectors with incorrect sized multimeter connections, use the adaptors contained in connector test adaptor kit KM-609 and test lead set KM-609-20.

8 This will prevent any possibility of spreading or damaging wiring harness terminals and later on causing a System intermittent failure. SDM connector YB189 is equipped with shorting link busbar. Whenever a diagnostic procedure asks a technician to check a circuit for an open or short while SDM connector YB189 is disconnected, the technician will need to open the shorting link busbar for that particular circuit. To open the shorting link busbar for a particular circuit, insert a spade type terminal, approximately 3 mm in diameter (or alternatively, use tool KM-609-9 from the KM-609 kit) into the openings (nominated as A, B, C, D, E or F in the following diagram) opposite the circuits terminal, refer Fig.

9 12M-1. SHORTING LINK BUSBAR. A Terminals 1 and 2 left hand pre-tensioner circuit B Terminals 3 and 4 right hand pre-tensioner circuit C Terminals 10 and 11 drivers air bag circuit D Terminals 13 and 14 passenger's air bag circuit E Terminals 16 and 17 left hand side air bag circuit F Terminals 18 and 19 right hand side air bag circuit Figure 12M-1. Figure 12M-2. Figure 12M-3. CHART A - DIAGNOSTIC CIRCUIT CHECK. Figure 12M-4. CIRCUIT DESCRIPTION. When investigating any complaint of an SRS problem or malfunction, always begin diagnosis with the following diagnostic circuit check.

10 This check is a preliminary procedure that checks to ensure the SDM is communicating on the serial data line as well as helping to identify a problem or malfunction and directing the technician to the appropriate diagnostic chart in this Section . With TECH 2 connected to the DLC and the ignition switched on, TECH 2 should display serial data communication. If TECH 2 does not display serial data, the serial data circuit maybe open or shorted. There are several other control modules that are connected to the serial data line (PCM, BCM, ABS/ETC, ECC, instruments and SDM).