B2757

Diagnostic Chart:

Schematics:

CIRCUIT DESCRIPTION
The switch that tailed and generated this diagnostic trouble code (DTC) is wired to the drivers door switch assembly (DDSA). This DDSA contains a microprocessor which takes the signal generated by the memory function switch and assigns a digital message to the switch signal. The DDSA then sends this message over a simple bus interface (SBI) link to the driver door module (DDM). The DDM examines the SBI for a switch input to determine the need for a change in driver seat, climate controls, radio settings, and mirror position.

When the DDM receives a valid memory switch input, it sends a SBI message to the right front door module to position the right mirror. The DDM sends a Class 2 message to the memory seat module to position the driver seat, the instrument panel module to adjust climate controls and the integrated radio control to adjust radio settings. The DDM also positions the left mirror.

CONDITIONS FOR RUNNING THE DTC
The DDM must be powered and can not have B1328 - Battery Voltage High or B1327-Battery Voltage Low as active DTCs for this DTC to set.

CONDITIONS FOR SETTING THE DTC
If the driver door module receives the message that the switch is closed for more than 30 continuous seconds, the driver door module sets this DTC.

ACTION TAKEN WHEN THE DTC SETS
The DDM ignores the continuous signal from the Driver Door Switch Assembly for the memory function switch, rules it invalid, and will not respond to it The DDM will respond to all other valid switch inputs.

CONDITIONS FOR CLEARING THE DTC
The DDM clears this DTC under two conditions. Either the switch signal is not received during one of the checks of the SBI, or the power to the DDM changes from OFF to ON.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. Checks the existing state of the memory recall switch number 1 by using the current state of the signal parameter.