B1163
CIRCUIT DESCRIPTIONWhen you turn ON the ignition the Instrument Panel Cluster (IPC) flashes the AIR BAG warning lamp 7 times. If no SIR DTCs are present, the Inflatable Restraint Sensing And Diagnostic Module (SDM) then commands the PC to turn the AIR BAG warning lamp OFF by sending a message over the Class 2 serial data line. Then the IPC returns a message to the SDM that the AIR BAG warning lamp is OFF.
CONDITIONS FOR SETTING THE DTC
If the SDM receives the wrong response from the IPC after sending the AIR BAG warning lamp message 6 times, the SDM will set DTC B1163. A loss of State Of Health (SOH) DTC U1096 or U1255 is also set. The test for DTC B1163 is run asynchronously during continuous monitoring.
ACTION TAKEN WHEN THE DTC SETS
The SDM sets DTC B1163 and either DTC U1096 or U1255.
CONDITIONS FOR CLEARING THE DTC
^ The ignition is turned OFF.
^ The SDM receives the correct IPC message response over the Serial Data Line Class 2.
^ You issue a scan tool CLEAR CODES command.
^ Once 250 malfunction free ignition cycles have occurred.
DIAGNOSTIC AIDS
The following failures could cause a history DTC B1163 to set.
^ The lost of battery voltage or ground to the IPC when the ignition switch in the ON position.
^ An intermittent short to battery or ground in the Class 2 serial data circuits.
^ An intermittent open to battery and/or ground in the Class 2 serial data circuits.
If any of the above conditions are found refer to Testing for Intermittent and Poor Connections in Diagrams.
The State Of Health (SOH) DTCs will likely be set with DTC B1163 when communication is lot between the IPC and the SDM. Check that the IPC is functioning properly.
TEST DESCRIPTION
