DTC C2121/21: No Signal from Transmitter ID1; DTC C2122/22: No Signal from Transmitter ID2; DTC C2123/23: No Signal from Transmitter ID3; DTC C2124/24: No Signal from Transmitter ID4; DTC C2181/81: Transmitter ID 1 not Received (Test Mode DTC); DTC C2182/82: Transmitter ID 2 not Received (Test Mode DTC); DTC C2183/83: Transmitter ID 3 not Received (Test Mode DTC); DTC C2184/84: Transmitter ID 4 not Received (Test Mode DTC) [09/2015 - 12/2017]: Wiring Diagram