DTC U1169, Loss Of Serial Communications - Mmm: Notes
NOTE:
To identify wire colors and components on Class 2 serial data line, see appropriate wiring diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS.
Every 2 seconds while ignition switch is in RUN position, control modules that communicate on class 2 data bus transmit a performance condition signal to indicate system is operating properly. Signal is then transmitted to PZM. DTC U1169 will set when PZM does not receive signal from Memory Mirror Module (MMM) after 3 consecutive monitoring cycles. DTC U1169 will clear when MMM transmits signal to PZM.