smoothMayhem
New member
Ok after a front end collision that deployed the airbags in my 98 TJ 4cyl which sensors need to be replaced or reset? I cant get my jeep started now. I have replaced the airbags.
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After a crash
- Thread starter smoothMayhem
- Start date
SteelHeadz
Super Moderator
The frontal impact sensors and the airbag module needs to be replaced. The airbag module is designed to shut down the PCM in an event of a collision to prevent the fuel and a source of ignition to cause a fire in the engine compartment. Your probbably going to have to go to a dealer to get the module configured and the PCM reset.
smoothMayhem
New member
I already installed the new airbags and I dont need to pay someone to install sensors. I kinda figured I would need something done to the PCM. You guys ever try those online places that reset airbag modules? 50 bucks.
SteelHeadz
Super Moderator
i've never tried it and probbably never will. You can try it yourself and see if it works. If i were you, i'd try to scan the PCM and ACM first and see what DTC's exist in both of the modules.
The Airbag Control Module (ACM) contains the impact sensor, and a microprocessor that monitors the impact sensor signals and the airbag system to determine its readiness. The ACM contains On-Board Diagnostics (OBD), and will send an airbag lamp-on message to the instrument cluster on the Chrysler Collision Detection (CCD) data bus to light the airbag indicator lamp in the instrument cluster when a monitored airbag system fault occurs.
The ACM also contains an energy-storage capacitor. This capacitor stores enough electrical energy to deploy the airbags for up to one second following a battery disconnect or failure during an impact. The purpose of the capacitor is to provide airbag system protection in a severe secondary impact, if the initial impact has damaged or disconnected the battery, but was not severe enough to deploy the airbags.
The ACM cannot be repaired and, if damaged or faulty, it must be replaced. However, there's still a chance that the module can still be salvaged depending on the DTC in the module. With this being said, if you use that generic module that erases and performs a reset on the control modules, make sure you stand outside the vehicle clear of all the airbags when you turn the key on. 9 out of 10 times that the ACM has deployed an airbag, the module needs to be replaced.
The Airbag Control Module (ACM) contains the impact sensor, and a microprocessor that monitors the impact sensor signals and the airbag system to determine its readiness. The ACM contains On-Board Diagnostics (OBD), and will send an airbag lamp-on message to the instrument cluster on the Chrysler Collision Detection (CCD) data bus to light the airbag indicator lamp in the instrument cluster when a monitored airbag system fault occurs.
The ACM also contains an energy-storage capacitor. This capacitor stores enough electrical energy to deploy the airbags for up to one second following a battery disconnect or failure during an impact. The purpose of the capacitor is to provide airbag system protection in a severe secondary impact, if the initial impact has damaged or disconnected the battery, but was not severe enough to deploy the airbags.
The ACM cannot be repaired and, if damaged or faulty, it must be replaced. However, there's still a chance that the module can still be salvaged depending on the DTC in the module. With this being said, if you use that generic module that erases and performs a reset on the control modules, make sure you stand outside the vehicle clear of all the airbags when you turn the key on. 9 out of 10 times that the ACM has deployed an airbag, the module needs to be replaced.
Crazy4diesels
New member
What a totally ridiculous system. The air bag system should have been independant of the engine ECM. They could have used an impact sensor like they had back in the early 90's to shut off the fuel pump (I wondered where those sensors went to...). Now you have to get the air bag system working again before you can drive the Jeep? And we are tied to dealers who are going out of business (and who I do not trust) to reset the computers? I really like my TJ but I could see upgrading back to a CJ someday when things get too hard to repair. -John
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