Principles of Operation
A supplemental restraint system (SRS) consists of a dual stage driver and passenger air bag module, safety belt retractor pretensioners, side air bag modules and side air curtains (containing an inflator/squib or gas generator and an air bag), impact sensors, a restraints control module (RCM), a clockspring, an air bag warning indicator, occupant classification sensor (OCS) system and a passenger air bag deactivation (PAD) indicator. These components are all interconnected by a wiring harness and powered by the vehicle's battery. The RCM includes a backup power supply. This feature provides sufficient backup power to deploy the SRS components in the event that the ignition circuit is lost or damaged during impact. The backup power supply will deplete its stored energy approximately one minute after power and/or ground has been removed from the RCM. The RCM performs an internal, external circuitry and component "self-test" during each startup. If a SRS fault exists, the RCM sends a message to instrument cluster (IC) module to illuminate the air bag warning indicator. In addition to the self-test at start up, the RCM continuously monitors all of its external and internal circuitry for faults.
In a frontal collision, the impact sensors located in the front of the vehicle detect the sudden deceleration and send an electrical signal to the RCM. The RCM uses the information from the impact sensors and the OCS system in the deployment determination. If the RCM determines that SRS deployment is required, the RCM sends voltage and current to the squib(s) causing the solid chemical propellant to undergo a rapid chemical reaction. This controlled reaction produces harmless nitrogen gas that fills the air bag(s)/side air curtains and/or activates the safety belt pretensioners/adaptive load limiting retractor(s) to control the tension of the safety belt(s).
In certain side collisions, the air curtain and seat-mounted side air bag on the side affected by the collision will be inflated, except that the OCS system will deactivate the passenger seat-mounted side air bag if it detects an empty unbuckled passenger seat or an unbuckled child or small person in the passenger seat. The side air curtain was designed to inflate between the side window area and occupant to further enhance the head protection provided to occupants in side impact collisions. The seat-mounted side air bag was designed to inflate between the door panel and occupant to further enhance the protection provided occupants in side impact collisions.
The RCM communicates through the data link connector (DLC) the current and historical DTCs on the high-speed controller area network (HS-CAN). The RCM also communicates over the HS-CAN to the IC module, occupant classification system module (OCSM) and PCM.
Normal Operation
During normal operation, the instrument cluster (IC) module will illuminate the air bag warning indicator continuously for 6 seconds after the ignition switch is placed to the RUN or ON position. If the supplemental restraint system (SRS) is fault free, the air bag warning indicator will turn off and remain off. If a fault is detected in the SRS, the restraints control module (RCM) will communicate to the IC module via the high-speed controller area network (HS-CAN) to illuminate the air bag warning indicator and it will remain illuminated for the rest of the key cycle. The instrument cluster module will illuminate the air bag warning indicator based on messaging from the RCM or if there is no communication between the RCM and IC module.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- IC module
- RCM
When the ignition is in the ON position, the passenger air bag deactivation (PAD) indicator prove-out period is initiated by the restraints control module (RCM). The RCM briefly activates the PAD indicator to verify to the occupants correct functional operation of the PAD indicator. Refer to Passenger Air Bag Deactivation (PAD) Indicator .
If the RCM detects an open or short to ground on the PAD indicator circuit, it will store DTC B1884 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
- DTC B1884 PAD Warning Lamp Circuit Failure - If the RCM detects an open circuit or short to ground on the PAD indicator circuit, it will set this DTC.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- PAD indicator
- RCM
When the ignition is in the ON position, the passenger air bag deactivation (PAD) indicator prove-out period is initiated by the restraints control module (RCM). The RCM briefly activates the PAD indicator to verify to the occupants correct functional operation of the PAD indicator. Refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) .
If the RCM detects a short to voltage on the PAD indicator circuit, it will store DTC B1890 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
- DTC B1890 PAD Warning Lamp Circuit Short to Battery - If the RCM detects a short to voltage on the PAD indicator circuit, it will set this DTC.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- PAD indicator
- RCM
The occupant classification sensor (OCS) system is used to classify the front passenger seat occupant in the event of a deployable impact. Refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) .
The OCSM monitors the 2 OCS rails (weight sensors) and circuitry for faults. If the OCSM detects a fault with the sensor(s) or circuitry, it will store DTC B2290 in memory and send a message to the RCM which will store DTC B2290 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
| Fault PIDs a | Description | Fault Trigger Condition |
|---|---|---|
| 2290_8_OD and 2290_8_CM | Passenger Seat OCS Sensor No.2 Circuit Short to Battery | When the OCSM senses a short to voltage on either one of sensor 2 circuits, a fault will be indicated. |
| 2290_9_OD and 2290_9_CM | Passenger Seat OCS Sensor No.2 Circuit Short to Ground | When the OCSM senses a short to ground on either one of sensor 1 circuits, a fault will be indicated. |
| 2290_10_OD and 2290_10_CM | Passenger Seat OCS Sensor No.2 Comm. Fault / Open | When the OCSM is unable to communicate with sensor 2 or senses an open circuit, a fault will be indicated. |
| 2290_11_OD and 2290_11_CM | Passenger Seat OCS Sensor No.2 Internal Fault | When the OCSM senses an internal failure with sensor 2, a fault will be indicated. |
| 2290_12_OD and 2290_12_CM | Passenger Seat OCS Sensor No.1 Circuit Short to Battery | When the OCSM senses a short to voltage on either one of sensor 2 circuits, a fault will be indicated. |
| 2290_13_OD and 2290_13_CM | Passenger Seat OCS Sensor No.1 Circuit Short to Ground | When the OCSM senses a short to ground on either one of sensor 2 circuits, a fault will be indicated. |
| 2290_14_OD and 2290_14_CM | Passenger Seat OCS Sensor No.1 Comm. Fault/Open | When the OCSM is unable to communicate with sensor 1 or senses an open circuit, a fault will be indicated. |
| 2290_15_OD and 2290_15_CM | Passenger Seat OCS Sensor No.1 Internal Fault | When the OCSM is unable to communicate with sensor 1 or senses an open circuit, a fault will be indicated. |
a Fault PIDs that end in OD indicate an on-demand status and are associated with on-demand DTC B2290. Fault PIDs that end in CM indicate continuous memory status and are associated with continuous DTC B2290.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- OCS component
The restraints control module (RCM) continuously monitors the safety belt retractor pretensioner circuits for an acceptable resistance range, unacceptable voltage and shorts to ground. The RCM will set on-demand and store DTC B2292 in memory if any of these conditions are detected to be outside of their respectful range. If the RCM detects a fault, it will send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
As the RCM continuously monitors safety belt retractor pretensioner circuits for resistance, it expects a normal resistance between 1.31 and 4.29 ohms.
If a loop resistance is between 0.9 and 1.31 or between 4.29 and 5 ohms, there exists a strong potential for an intermittent fault, a DTC may or may not set. The RCM will also set an on-demand DTC if the loop resistance is less than 0.9 ohm or greater than 5 ohms.
Note. When monitoring fault and/or resistance PIDs with the scan tool, it may take up to 2 seconds for the scan tool display to update.
| Fault PIDs a | Description | Fault Trigger Condition |
|---|---|---|
| 2292_24_OD and 2292_24_CM | Pretensioner Circuit Short to Ground, Front Passenger Side | When the RCM senses a short to ground on either of the passenger pretensioner circuits, a fault will be indicated. |
| 2292_25_OD and 2292_25_CM | Pretensioner Circuit Short to Battery, Front Passenger Side | When the RCM senses a short to voltage on either of the passenger pretensioner circuits, a fault will be indicated. |
| 2292_26_OD and 2292_26_CM | Pretensioner Circuit Open, Front Passenger Side | When the RCM measures resistance greater than 5 ohms between the passenger pretensioner circuits, a fault will be indicated. |
| 2292_27_OD and 2292_27_CM | Pretensioner Circuit Resistance Low, Front Passenger Side | When the RCM measures resistance less than 0.9 ohm between the passenger pretensioner circuits, a fault will be indicated. |
| 2292_28_OD and 2292_28_CM | Pretensioner Circuit Short to Ground, Front Driver Side | When the RCM senses a short to ground on either of the driver pretensioner circuits, a fault will be indicated. |
| 2292_29_OD and 2292_29_CM | Pretensioner Circuit Short to Battery, Front Driver Side | When the RCM senses a short to voltage on either of the driver pretensioner circuits, a fault will be indicated. |
| 2292_30_OD and 2292_30_CM | Pretensioner Circuit Open, Front Driver Side | When the RCM measures resistance greater than 5 ohms between the driver pretensioner circuits, a fault will be indicated. |
| 2292_31_OD and 2292_31_CM | Pretensioner Circuit Resistance Low, Front Driver Side | When the RCM measures resistance less than 0.9 ohm between the driver pretensioner circuits, a fault will be indicated. |
a Fault PIDs that end in OD indicate an on-demand status and are associated with on-demand DTC B2292. Fault PIDs that end in CM indicate continuous memory status and are associated with continuous memory DTC B2292.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Safety belt retractor pretensioner
- RCM
The restraints control module (RCM) continuously monitors all front air bag module circuits (loop) for an acceptable resistance range, unacceptable voltage and shorts to ground. The RCM will set on-demand and store DTC B2293 in memory if any of these conditions are detected to be outside of their respectful range. If the RCM detects a fault on any of the front air bag circuits, it will store DTC B2293 in memory and send a message to the instrument cluster module to illuminate the air bag warning indicator.
As the RCM continuously monitors all front air bag module circuits for resistance, it expects a normal resistance for the driver and passenger air bag modules loop 1 and 2, between 1.31 to 4.29 ohms.
If a loop resistance for the driver and/or passenger air bag loop 1 and/or 2 is between 0.9 and 1.31 or between 4.29 and 5 ohms, there exists a strong potential for an intermittent fault, a DTC may or may not set. The RCM will also set an on-demand DTC if the loop resistance is less than 0.9 ohm or greater than 5 ohms.
| Fault PIDs a | Description | Fault Trigger Condition |
|---|---|---|
| 2293_16_OD and 2293_16_CM | Air Bag Inflator Circuit Resistance Low - Loop No. 2, Front Passenger Side | When the RCM measures resistance less than 0.9 ohm between the passenger air bag loop circuits, a fault will be indicated. |
| 2293_17_OD and 2293_17_CM | Air Bag Circuit Open - Loop No. 2, Front Passenger Side | When the RCM measures resistance greater than 5 ohms between the passenger air bag loop circuits, a fault will be indicated. |
| 2293_18_OD and 2293_18_CM | Air Bag Circuit Short to Battery - Loop No. 2, Front Passenger Side | When the RCM senses a short to voltage on either of the passenger air bag loop circuits, a fault will be indicated. |
| 2293_19_OD and 2293_19_CM | Air Bag Circuit Short to Ground - Loop No. 2, Front Passenger Side | When the RCM senses a short to ground on either of the passenger air bag loop circuits, a fault will be indicated. |
| 2293_20_OD and 2293_20_CM | Air Bag Inflator Circuit Resistance Low - Loop No. 2, Front Driver Side | When the RCM measures resistance less than 0.9 ohm between the driver air bag loop circuits, a fault will be indicated. |
| 2293_21_OD and 2293_21_CM | Air Bag Circuit Open - Loop No. 2, Front Driver Side | When the RCM measures resistance greater than 5 ohms between the driver air bag loop circuits, a fault will be indicated. |
| 2293_22_OD and 2293_22_CM | Air Bag Circuit Short to Battery - Loop No. 2, Front Driver Side | When the RCM senses a short to voltage on either of the driver air bag loop circuits, a fault will be indicated. |
| 2293_23_OD and 2293_23_CM | Air Bag Circuit Short to Ground - Loop No. 2, Front Driver Side | When the RCM senses a short to ground on either of the driver air bag loop circuits, a fault will be indicated. |
| 2293_24_OD and 2293_24_CM | Air Bag Inflator Circuit Resistance Low - Loop No. 1, Front Passenger Side | When the RCM measures resistance less than 0.9 ohm between the passenger air bag loop circuits, a fault will be indicated. |
| 2293_25_OD and 2293_25_CM | Air Bag Circuit Open - Loop No. 1, Front Passenger Side | When the RCM measures resistance greater than 5 ohms between the passenger air bag loop circuits, a fault will be indicated. |
| 2293_26_OD and 2293_26_CM | Air Bag Circuit Short to Battery - Loop No. 1, Front Passenger Side | When the RCM senses a short to voltage on either of the passenger air bag loop circuits, a fault will be indicated. |
| 2293_27_OD and 2293_27_CM | Air Bag Circuit Short to Ground - Loop No. 1, Front Passenger Side | When the RCM senses a short to ground on either of the passenger air bag loop circuits, a fault will be indicated. |
| 2293_28_OD and 2293_28_CM | Air Bag Inflator Circuit Resistance Low - Loop No. 1, Front Driver Side | When the RCM measures resistance less than 0.9 ohm between the driver air bag loop circuits, a fault will be indicated. |
| 2293_29_OD and 2293_29_CM | Air Bag Circuit Open - Loop No. 1, Front Driver Side | When the RCM measures resistance greater than 5 ohms between the driver air bag loop circuits, a fault will be indicated. |
| 2293_30_OD and 2293_30_CM | Air Bag Circuit Short to Battery - Loop No. 1, Front Driver Side | When the RCM senses a short to voltage on either of the driver air bag loop circuits, a fault will be indicated. |
| 2293_31_OD and 2293_31_CM | Air Bag Circuit Short to Ground - Loop No. 1, Front Driver Side | When the RCM senses a short to ground on either of the driver air bag loop circuits, a fault will be indicated. |
a Fault PIDs that end in OD indicate an on-demand status and are associated with on-demand DTC B2293. Fault PIDs that end in CM indicate continuous memory status and are associated with continuous DTC B2293.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Clockspring
- Driver air bag module
- RCM
The restraints control module (RCM) continuously monitors the driver and passenger safety canopy module circuits (loop) for an acceptable resistance range, unacceptable voltage and shorts to ground. The RCM will set on-demand and store DTC B2294 in memory if any of these conditions are detected to be outside of their respectful range. If the RCM detects a fault, it will send a message to the instrument cluster module to illuminate the air bag warning indicator.
As the RCM continuously monitors safety canopy module circuits for resistance, it expects a normal resistance between 1.31 to 4.29 ohms.
If a loop resistance is between 0.9 and 1.31 or between 4.29 and 5 ohms, there exists a strong potential for an intermittent fault, a DTC may or may not set. The RCM will also set an on-demand DTC if the loop resistance is less than 0.9 ohm or greater than 5 ohms.
Note. When monitoring fault and/or resistance PIDs with the scan tool, it may take up to 2 seconds for the scan tool display to update.
| Fault PIDs a | Description | Fault Trigger Condition |
|---|---|---|
| 2294_24_OD and 2294_24_CM | A - B or A - C Pillar Curtain Circuit Resistance Low, Passenger Side | When the RCM measures resistance less than 0.9 ohm between the passenger safety canopy circuits, a fault will be indicated. |
| 2294_25_OD and 2294_25_CM | A - B or A - C Pillar Curtain Circuit Open, Passenger Side | When the RCM measures resistance greater than 5 ohms between the passenger safety canopy circuits, a fault will be indicated. |
| 2294_26_OD and 2294_26_CM | A - B or A - C Pillar Curtain Circuit Short to Ground, Passenger Side | When the RCM senses a short to ground on either of the passenger safety canopy circuits, a fault will be indicated. |
| 2294_27_OD and 2294_27_CM | A - B or A - C Pillar Curtain Circuit Short to Battery, Passenger Side | When the RCM senses a short to voltage on either of the passenger safety canopy circuits, a fault will be indicated. |
| 2294_28_OD and 2294_28_CM | A - B or A - C Pillar Curtain Circuit Resistance Low, Driver Side | When the RCM measures resistance less than 0.9 ohm between the driver safety canopy circuits, a fault will be indicated. |
| 2294_29_OD and 2294_29_CM | A - B or A - C Pillar Curtain Circuit Open, Driver Side | When the RCM measures resistance greater than 5 ohms between the driver safety canopy circuits, a fault will be indicated. |
| 2294_30_OD and 2294_30_CM | A - B or A - C Pillar Curtain Circuit Short to Ground, Driver Side | When the RCM senses a short to ground on either of the driver safety canopy circuits, a fault will be indicated. |
| 2294_31_OD and 2294_31_CM | A - B or A - C Pillar Curtain Circuit Short to Battery, Driver Side | When the RCM senses a short to voltage on either of the driver safety canopy circuits, a fault will be indicated. |
a Fault PIDs that end in OD indicate an on-demand status and are associated with on-demand DTC B2294. Fault PIDs that end in CM indicate continuous memory status and are associated with continuous DTC B2294.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Safety canopy module
- RCM
A side air bag module provides protection of the thorax area (between the neck and abdomen) of the body, working in conjunction with the head protection provided by a safety canopy module. Refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) .
The restraints control module (RCM) continuously monitors the driver and passenger side air bag module circuits (loop) for an acceptable resistance range, unacceptable voltage and shorts to ground. The RCM will set on-demand and store DTC B2294 in memory if any of these conditions are detected to be outside of their respectful range. If the RCM detects a fault, it will send a message to the instrument cluster module to illuminate the air bag warning indicator.
As the RCM continuously monitors side air bag module circuits for resistance, it expects a normal resistance between 1.31 to 4.29 ohms.
If a loop resistance is between 0.9 and 1.31 or between 4.29 and 5 ohms, there exists a strong potential for an intermittent fault, a DTC may or may not set. The RCM will also set an on-demand DTC if the loop resistance is less than 0.9 ohm or greater than 5 ohms.
Note. When monitoring fault and/or resistance PIDs with the scan tool, it may take up to 2 seconds for the scan tool display to update.
| Fault PIDs a | Description | Fault Trigger Condition |
|---|---|---|
| 2295_24_OD and 2295_24_CM | Side Air Bag Circuit Resistance Low, Front Passenger Side | When the RCM measures resistance less than 0.9 ohm between the passenger side air bag module circuits, a fault will be indicated. |
| 2295_25_OD and 2295_25_CM | Side Air Bag Circuit Open, Front Passenger Side | When the RCM measures resistance greater than 5 ohms between the passenger side air bag module circuits, a fault will be indicated. |
| 2295_26_OD and 2295_26_CM | Side Air Bag Circuit Short to Ground, Front Passenger Side | When the RCM senses a short to ground on either of the passenger side air bag module circuits, a fault will be indicated. |
| 2295_27_OD and 2295_27_CM | Side Air Bag Circuit Short to Battery, Front Passenger Side | When the RCM senses a short to voltage on either of the passenger side air bag module circuits, a fault will be indicated. |
| 2295_28_OD and 2295_28_CM | Side Air Bag Circuit Resistance Low, Front Driver Side | When the RCM measures resistance less than 0.9 ohm between the driver side air bag module circuits, a fault will be indicated. |
| 2295_29_OD and 2295_29_CM | Side Air Bag Circuit Open, Front Driver Side | When the RCM measures resistance greater than 5 ohms between the driver side air bag module circuits, a fault will be indicated. |
| 2295_30_OD and 2295_30_CM | Side Air Bag Circuit Short to Ground, Front Driver Side | When the RCM senses a short to ground on either of the driver side air bag module circuits, a fault will be indicated. |
| 2295_31_OD and 2295_31_CM | Side Air Bag Circuit Short to Battery, Front Driver Side | When the RCM senses a short to voltage on either of the driver side air bag module circuits, a fault will be indicated. |
a Fault PIDs that end in OD indicate an on-demand status and are associated with on-demand DTC B2295. Fault PIDs that end in CM indicate continuous memory status and are associated with continuous DTC B2295.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Side air bag module
- RCM
The restraints control module (RCM) continuously communicates with all impact sensors for external and internal sensor data. The RCM also continuously monitors all of the impact sensor circuits for a short to voltage, short to ground and open circuits. If the RCM detects any communication or circuit faults with any of the impact sensors, it will store DTC B2296 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
| Fault PIDs a | Description | Fault Trigger Condition |
|---|---|---|
| 2296_18_OD and 2296_18_CM | Driver/Center Front Crash Sensor Internal Fault | When the RCM senses an internal failure with the driver/center front impact sensor, a fault will be indicated. |
| 2296_19_OD and 2296_19_OD | Driver/Center Front Crash Sensor Mount/Communication Fault | When the RCM is unable to communicate with the driver/center front impact sensor, a fault will be indicated. |
| 2296_24_OD and 2296_24_CM | Side Crash Sensor 2 Internal Fault, Passenger side | When the RCM senses an internal failure with the passenger side second row impact sensor, a fault will be indicated. |
| 2296_25_OD and 2296_25_CM | Side Crash Sensor Mount or Communication Fault, Row No.2 Passenger Side | When the RCM is unable to communicate with the passenger side second row impact sensor, a fault will be indicated. |
| 2296_26_OD and 2296_26_CM | Side Crash Sensor 2 Internal Fault, Driver side | When the RCM senses an internal failure with the driver side second row impact sensor, a fault will be indicated. |
| 2296_27_OD and 2296_27_CM | Side Crash Sensor Mount or Communication Fault, Row No.2 Driver Side | When the RCM is unable to communicate with the driver side second row impact sensor, a fault will be indicated. |
| 2296_28_OD and 2296_28_CM | Side Crash Sensor Internal Fault, Front Passenger Side | When the RCM senses an internal failure with the passenger side first row impact sensor, a fault will be indicated. |
| 2296_29_OD and 2296_29_CM | Side Crash Sensor Mount or Communication Fault, Front Passenger Side | When the RCM is unable to communicate with the passenger side first row impact sensor, a fault will be indicated. |
| 2296_30_OD and 2296_30_CM | Side Crash Sensor Internal Fault, Front Driver Side | When the RCM senses an internal failure with the driver/center front impact sensor, a fault will be indicated. |
| 2296_31_OD and 2296_31_CM | Side Crash Sensor Mount or Communication Fault, Front Driver Side | When the RCM is unable to communicate with the driver side first row impact sensor, a fault will be indicated. |
a Fault PIDs that end in OD indicate an on-demand status and are associated with on-demand DTC B2296. Fault PIDs that end in CM indicate continuous memory status and are associated with continuous DTC B2296.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Impact sensor
- Incorrect sensor mounting
- RCM
As part of the supplemental restraint system (SRS), the driver and passenger safety belt buckles are equipped with safety belt buckle switches. The safety belt buckles are comprised of integrated circuits called Hall-effect switches. The safety belt buckle switches indicate to the restraints control module (RCM) whether the safety belt buckles are buckled or unbuckled.
The RCM supplies current to the safety belt buckle switch. Current flows through the switch, buckled or unbuckled to ground. The RCM will sense the difference in this current draw, 6 mA (unbuckled) or 15 mA (buckled), and use this information in determining the deployment rate of the dual-stage driver and passenger air bag modules. If the RCM detects current out of this range, it will store DTC B2434 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
- DTC B2434 Drivers Seat Belt Buckle Switch Circuit Short to Ground - If the RCM detects a short to ground on the driver safety belt buckle circuit, it will set this DTC.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Driver safety belt buckle switch
- RCM
As part of the supplemental restraint system (SRS), the driver and passenger safety belt buckles are equipped with safety belt buckle switches. The safety belt buckles are comprised of integrated circuits called Hall-effect switches. The safety belt buckle switches indicate to the restraints control module (RCM) whether the safety belt buckles are buckled or unbuckled.
The RCM supplies current to the safety belt buckle switch. Current flows through the switch, buckled or unbuckled to ground. The RCM will sense the difference in this current draw, 6 mA (unbuckled) or 15 mA (buckled), and use this information in determining the deployment rate of the dual-stage driver and passenger air bag modules. If the RCM detects current out of this range, it will store DTC B2435 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
- DTC B2435 Drivers Seat Belt Buckle Switch Resistance Out of Range - If the RCM detects a current out of range between buckled and unbuckled on the driver safety belt buckle switch, it will set this DTC.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Driver safety belt buckle and pretensioner assembly
- RCM
As part of the supplemental restraint system (SRS), the driver and passenger safety belt buckles are equipped with safety belt buckle switches. The safety belt buckles are comprised of integrated circuits called Hall-effect switches. The safety belt buckle switches indicate to the restraints control module (RCM) whether the safety belt buckles are buckled or unbuckled.
The RCM supplies current to the safety belt buckle switch. Current flows through the switch, buckled or unbuckled to ground. The RCM will sense the difference in this current draw, 6 mA (unbuckled) or 15 mA (buckled), and use this information in determining the deployment rate of the dual-stage driver and passenger air bag modules. If the RCM detects current out of this range, it will store DTC B2438 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
Note. When monitoring fault and/or resistance PIDs with the scan tool, it may take up to 2 seconds for the scan tool display to update.
- DTC B2438 Passenger's Seat Belt Buckle Switch Circuit Short to Ground - If the RCM detects a short to ground on the passenger safety belt buckle circuit, it will set this DTC.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Passenger safety belt buckle switch
- RCM
As part of the supplemental restraint system (SRS), the driver and passenger safety belt buckles are equipped with safety belt buckle switches. The safety belt buckles are comprised of integrated circuits called Hall-effect switches. The safety belt buckle switches indicate to the restraints control module (RCM) whether the safety belt buckles are buckled or unbuckled.
The RCM supplies current to the safety belt buckle switch. Current flows through the switch, buckled or unbuckled to ground. The RCM will sense the difference in this current draw, 6 mA (unbuckled) or 15 mA (buckled), and use this information in determining the deployment rate of the dual-stage driver and passenger air bag modules. If the RCM detects current out of this range, it will store DTC B2439 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
Note. When monitoring fault and/or resistance PIDs with the scan tool, it may take up to 2 seconds for the scan tool display to update.
- DTC B2439 Passengers Seat Belt Buckle Switch Resistance Out of Range - If the RCM detects a current out of range between buckled and unbuckled on the passenger safety belt buckle switch, it will set this DTC.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Passenger safety belt buckle switch
- RCM
As part of the supplemental restraint system (SRS), the driver and passenger safety belt buckles are equipped with safety belt buckle switches. The safety belt buckles are comprised of integrated circuits called Hall-effect switches. The safety belt buckle switches indicate to the restraints control module (RCM) whether the safety belt buckles are buckled or unbuckled.
The RCM supplies current to the safety belt buckle switch. Current flows through the switch, buckled or unbuckled to ground. The RCM will sense the difference in this current draw, 6 mA (unbuckled) or 15 mA (buckled), and use this information in determining the deployment rate of the dual-stage driver and passenger air bag modules.
If the RCM detects an open circuit or short to voltage fault, it will store DTC B2691 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
Note. When monitoring fault and/or resistance PIDs with the scan tool, it may take up to 2 seconds for the scan tool display to update.
- DTC B2691 Seat Belt Buckle Switch Circuit Fault, Front Driver's Side - If the RCM detects an open or short to voltage on the driver safety belt buckle switch circuit, it will set this DTC.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Driver safety belt buckle switch
- RCM
As part of the supplemental restraint system (SRS), the driver and passenger safety belt buckles are equipped with safety belt buckle switches. The safety belt buckles are comprised of integrated circuits called Hall-effect switches. The safety belt buckle switches indicate to the restraints control module (RCM) whether the safety belt buckles are buckled or unbuckled.
The RCM supplies current to the safety belt buckle switch. Current flows through the switch, buckled or unbuckled to ground. The RCM will sense the difference in this current draw, 6 mA (unbuckled) or 15 mA (buckled), and use this information in determining the deployment rate of the dual-stage driver and passenger air bag modules.
If the RCM detects an open circuit or short to voltage fault, it will store DTC B2692 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
Note. When monitoring fault and/or resistance PIDs with the scan tool, it may take up to 2 seconds for the scan tool display to update.
- DTC B2692 Front Passenger's Safety Belt Buckle Switch Circuit Fault - If the RCM detects an open or short to voltage on the passenger safety belt buckle switch circuit, it will set this DTC.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Passenger safety belt buckle switch
- RCM
The restraints control module (RCM) monitors all the deployable devices for a cross link between the circuits of another deployable device. If the RCM detects a short between the circuits of the deployable devices, it will store DTC B2792 and send a message to the instrument cluster (IC) module to illuminate the air bag indicator.
| Fault PIDs a | Description | Fault Trigger Condition |
|---|---|---|
| 2792_8_OD and 2792_8_CM | A-B or A-C pillar Curtain, Passenger Side | When the RCM detects a short between the circuits of 2 deployable devices, a fault will be indicated. |
| 2792_9_OD and 2792_9_CM | A-B or A-C pillar Curtain, Driver Side | When the RCM detects a short between the circuits of 2 deployable devices, a fault will be indicated. |
| 2792_12_OD and 2792_12_CM | Side Airbag Passenger | When the RCM detects a short between the circuits of 2 deployable devices, a fault will be indicated. |
| 2792_13_OD and 2792_13_CM | Side Airbag Driver | When the RCM detects a short between the circuits of 2 deployable devices, a fault will be indicated. |
| 2792_26_OD and 2792_26_CM | Pretensioner Passenger | When the RCM detects a short between the circuits of 2 deployable devices, a fault will be indicated. |
| 2792_27_OD and 2792_27_CM | Pretensioner Driver | When the RCM detects a short between the circuits of 2 deployable devices, a fault will be indicated. |
| 2792_28_OD and 2792_28_CM | Airbag Passenger Front Loop #2 | When the RCM detects a short between the circuits of 2 deployable devices, a fault will be indicated. |
| 2792_29_OD and 2792_29_CM | Airbag Passenger Front Loop #1 | When the RCM detects a short between the circuits of 2 deployable devices, a fault will be indicated. |
| 2792_30_OD and 2792_30_CM | Airbag Driver Front Loop #2 | When the RCM detects a short between the circuits of 2 deployable devices, a fault will be indicated. |
| 2792_31_OD and 2792_31_CM | Airbag Driver Front Loop #1 | When the RCM detects a short between the circuits of 2 deployable devices, a fault will be indicated. |
a Fault PIDs that end in OD indicate an on-demand status and are associated with on-demand DTC B2792. Fault PIDs that end in CM indicate continuous memory status and are associated with continuous DTC B2792.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- RCM
The occupant classification sensor (OCS) system is used to classify the front passenger seat occupant in the event of a deployable impact. Refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) .
The occupant classification system module (OCSM) monitors the 2 OCS rails (weight sensors) and circuity for faults. If the OCSM detects an object within the OCS rails, it will store DTC B229A in memory and send a message to the restraints control module (RCM) which sends a message to the instrument cluster (IC) module to illuminates the air bag indicator.
- DTC B229A Occupant Classification System Contamination - If the OCSM detects foreign object(s)/substance in one or both OCS rails (weight sensors), it will set this DTC.
This pinpoint test is intended to diagnose the following
- A foreign object within an occupant classification sensor rail
- OCS system component
The occupant classification sensor (OCS) system is used to classify the front passenger seat occupant in the event of a deployable impact. Refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) .
The occupant classification system module (OCSM) monitors the weight sensors and circuitry for faults. If the OCSM detects an obstruction on one or all OCS weight sensors, it will store DTC B229B in memory and send a message to the restraints control module (RCM) which sends a message to the instrument cluster (IC) module to illuminates the air bag indicator.
- DTC B229B Occupant Classification System Obstruction - If the OCSM detects a negative force on one or all OCS weight sensors, it will set this DTC.
This pinpoint test is intended to diagnose the following
- A foreign object placed under or contacting the passenger seat
- OCS system component(s)
As part of the supplemental restraint system (SRS), the driver seat is equipped with a seat track position sensor. The seat track position sensor is comprised of integrated circuits called Hall-effect switch. The seat track position sensor indicates to the restraints control module (RCM) the position of the driver seat, forward or rearward.
The RCM supplies current to the seat track position sensor. Current flows through the switch, both in the forward or rearward seat position to ground. The RCM will sense the difference in this current draw, 6 mA (forward) or 15 mA (rearward), and use this information in determining the deployment rate of the dual-stage driver air bag module. If the RCM detects current out of range, it will store C1946 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
Note. When monitoring fault and/or resistance PIDs with the scan tool, it may take up to 2 seconds for the scan tool display to update.
- DTC C1946 Front Driver's Seat Track Position Switch Circuit Open - If the RCM detects a open on the driver seat track position sensor circuit, it will set this DTC.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Driver seat track position sensor
- RCM
As part of the supplemental restraint system (SRS), the driver seat is equipped with a seat track position sensor. The seat track position sensor is comprised of integrated circuits called Hall-effect switch. The seat track position sensor indicates to the restraints control module (RCM) the position of the driver seat, forward or rearward.
The RCM supplies current to the seat track position sensor. Current flows through the switch, both in the forward or rearward seat position to ground. The RCM will sense the difference in this current draw, 6 mA (forward) or 15 mA (rearward), and use this information in determining the deployment rate of the dual-stage driver air bag module. If the RCM detects current out of range, it will set a DTC.
If the RCM detects a short to ground, it will store DTC C1947 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
- DTC C1947 Front Driver's Seat Track Position Switch Circuit Short to Ground - If the RCM detects a short to ground on the driver seat track position sensor circuit, it will set this DTC.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Driver seat track position sensor
- RCM
As part of the supplemental restraint system (SRS), the driver seat is equipped with a seat track position sensor. The seat track position sensor is comprised of integrated circuits called Hall-effect switch. The seat track position sensor indicate to the restraints control module (RCM) the position of the driver seat, forward or rearward.
The RCM supplies current to the seat track position sensor. Current flows through the switch, both in the forward or rearward seat position to ground. The RCM will sense the difference in this current draw, 6 mA (forward) or 15 mA (rearward), and use this information in determining the deployment rate of the dual-stage driver air bag module. If the RCM detects current out of range, it will set a DTC.
If the RCM detects a current out of range condition, it will store DTC C1948 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
Note. When monitoring fault and/or resistance PIDs with the scan tool, it may take up to 2 seconds for the scan tool display to update.
- DTC C1948 Front Driver's Seat Track Position Switch Circuit Resistance out of Range - If the RCM detects a current out of range between forward and rearward on the driver seat track position switch, it will set this DTC.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- Driver seat track position sensor
- RCM
As part of the supplemental restraint system (SRS), the driver seat is equipped with a seat track position sensor. The seat track position sensor is comprised of integrated circuits called Hall-effect switch. The seat track position sensor indicate to the restraints control module (RCM) the position of the driver seat, forward or rearward.
The RCM supplies current to the seat track position sensor. Current flows through the switch, both in the forward or rearward seat position to ground. The RCM will sense the difference in this current draw, 6 mA (forward) or 15 mA (rearward), and use this information in determining the deployment rate of the dual-stage driver air bag module. If the RCM detects current out of range, it will set a DTC.
If the RCM detects an open circuit or a short to battery on the driver seat track position sensor, it will store DTC C1981 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
Note. When monitoring fault and/or resistance PIDs with the scan tool, it may take up to 2 seconds for the scan tool display to update.
- DTC C1981 Front Driver's Seat Track Position Switch Circuit Fault - If the RCM detects a short to voltage on the driver seat track position sensor circuit, it will set this DTC.
This pinpoint test is intended to diagnose the following
- Wiring, terminals or connectors
- RCM