Auto Service Professional

JUN 2018

Magazine for the auto service professional

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54 A S P J u n e 2 018 seat belt pretensioner circuit. e Ford spec is 3.2-1.4Ω, so installing a 2Ω test resistor will be used. (ese Escapes had a fretting issue in the pretensioner connector and the simple act of disconnecting and reconnecting the connector would oen rectify the issue.) 2011 Honda Civics set a code 27-10 (Open in the Driver's Seat Belt Buckle Tensioner). e factory manual wants you to use the SRS Infla- tor Simulator 07SAZ-TB4011A and the 2Ω con- nector to simulate the seat belt pretensioner. In- stalling a 2Ω test resistor will do the same thing. Clear the codes. If the code is gone, the seat belt pretensioner is the issue. If the code doesn't clear, further testing will be needed. Using these test resistors also provides an easy test to verify a bad clock spring assembly. Using the shorting bars (if equipped) in the SRS connectors is another quick way of verifying an inflator circuit. Many SRS connectors have a spring-loaded shorting bar that shorts across the terminals in the SRS connector when the con- nector is disconnected or the connector position assurance (CPA) retainer lock is removed. If the SRS code relates to high resistance, you discon- nect the connector and the SRS diagnostic code should change to a low resistance code due to the shorting bars. is verifies that circuit is good and that the cause of the high resistance is likely the inflator or the connection. Common SRS controller issues is category of repairs can be separated into two parts: SRS module replacement and occupant classification system (OCS) recalibration. Each part has its own issues, complexity and tool use requirements. Most SRS modules are good for one collision event and will need to be replaced aer a colli- sion. e service information is very specific on what parts and pieces need to be replaced aer a crash and most SRS modules will need to be set up, programmed or re-calibrated aer repairs. is is different from most seat belt pretension- ers, airbags and crash sensors that typically don't require to be set up and are plug and play. Aer SRS module replacement, many vehicles may require a factory scanner and possibly facto- ry-based internet service to complete the replace- ment. It is very important to thoroughly read the proper service information and know what your scan tool capabilities are before you commit to SRS module replacements and setup. is same situa- tion can arise if a TSB indicates that a reflash or programming update is required. Most customers will bring in their vehicle for diagnostics if the warning light says there is an airbag issue. Corrosion and water intrusion is a common cause of a crash sensor failure on GM pickup trucks. This sensor has swelled and is broken. Another example of corrosion, this SRS module was under the driver's seat of a Chevy Blazer that had a windshield leak. S R S D i a g n o s t i c s

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