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Diagnostic Trouble Code Chart

Mayday ECU Assembly 

MAYDAY ECU ASSEMBLY DIAGNOSTIC TROUBLE CODE CHART

DTC Code Detection Item Trouble Area Indicator (red LED) Illuminates When DTC is Present See
1-1  Services Disabled
  • No problem
No DTC 1-1 SERVICES DISABLED 
1-2  Option Configuration Error
  • Mayday ECU assembly
Yes DTC 1-2 OPTION CONFIGURATION ERROR 
2-1  EEPROM Communication Error
  • Mayday ECU assembly
Yes DTC 2-1 EEPROM COMMUNICATION ERROR; DTC 2-2 EEPROM CHECKSUM ERROR 
2-2  EEPROM Checksum Error
  • Mayday ECU assembly
Yes DTC 2-1 EEPROM COMMUNICATION ERROR; DTC 2-2 EEPROM CHECKSUM ERROR 
2-3  Digital Signal Processor Communication Error
  • Mayday ECU assembly
Yes DTC 2-3 DIGITAL SIGNAL PROCESSOR COMMUNICATION ERROR; DTC 2-4 GPS COMMUNICATION ERROR 
2-4  GPS Communication Error
  • Mayday ECU assembly
Yes DTC 2-3 DIGITAL SIGNAL PROCESSOR COMMUNICATION ERROR; DTC 2-4 GPS COMMUNICATION ERROR 
2-5  Network Access Device Diagnostic Error
  • Mayday ECU assembly
Yes DTC 2-5 NETWORK ACCESS DEVICE DIAGNOSTIC ERROR; DTC 2-6 NETWORK ACCESS DEVICE COMMUNICATION ERROR 
2-6  Network Access Device Communication Error
  • Mayday ECU assembly
Yes DTC 2-5 NETWORK ACCESS DEVICE DIAGNOSTIC ERROR; DTC 2-6 NETWORK ACCESS DEVICE COMMUNICATION ERROR 
3-1  GPS Antenna Error
  • Mayday ECU assembly
  • GPS antenna assembly
Yes DTC 3-1 GPS ANTENNA ERROR 
3-2  Cellular Phone Antenna Error
  • Mayday ECU assembly
  • Telephone antenna
  • Wire harness
Yes DTC 3-2 CELLULAR PHONE ANTENNA ERROR 
3-3  GPS Signal not Received
  • Location or service area
  • GPS antenna assembly
Yes DTC 3-3 GPS SIGNAL NOT RECEIVED 
4-1  Red LED Error
  • Mayday ECU assembly
  • Map light plate assembly
  • Mayday switch assembly
  • Wire harness
Not applicable DTC 4-1 RED LED ERROR 
4-2  Green LED Error
  • Mayday ECU assembly
  • Map light plate assembly
  • Mayday switch assembly
  • Wire harness
Yes DTC 4-2 GREEN LED ERROR 
4-3  Overhead Module Microphone Error
  • Mayday ECU assembly
  • Map light plate assembly
  • Microphone assembly
  • Microphone amplifier assembly
  • Wire harness
Yes DTC 4-3 OVERHEAD MODULE MICROPHONE ERROR 
4-4  SERVICES, PHONE or PTT Button Stuck
  • Mayday ECU assembly
  • Map light plate assembly
  • Mayday switch assembly
Yes DTC 4-4 SERVICES, PHONE OR PTT BUTTON STUCK 
4-5  EMERGENCY, VOL+ or VOL- Button Stuck
  • Mayday ECU assembly
  • Map light plate assembly
  • Mayday switch assembly
Yes DTC 4-5 EMERGENCY, VOL+ OR VOL- BUTTON STUCK 
4-6  SERVICES, PHONE or PTT Button has Connection Error
  • Mayday ECU assembly
  • Map light plate assembly
  • Mayday switch assembly
  • Wire harness
Yes DTC 4-6 SERVICES, PHONE OR PTT BUTTON HAS CONNECTION ERROR 
4-7  EMERGENCY, VOL+ or VOL- Button has Connection Error
  • Mayday ECU assembly
  • Map light plate assembly
  • Mayday switch assembly
  • Wire harness
Yes DTC 4-7 EMERGENCY, VOL+ OR VOL- BUTTON HAS CONNECTION ERROR 
5-1  BEAN Communication Error
  • Mayday ECU assembly
  • Light control switch circuit
  • Multiplex network body ECU (main)
  • Wire harness
Yes DTC 5-1 BEAN COMMUNICATION ERROR 
5-2  Airbag Signal Communication Error
  • Mayday ECU assembly
  • Center airbag sensor assembly
  • Wire harness
Yes DTC 5-2 AIRBAG SIGNAL COMMUNICATION ERROR 
6-1  Backup Battery Depleted
  • Mayday battery (backup battery)
Yes DTC 6-1 BACKUP BATTERY DEPLETED 
6-2  Low Vehicle Battery Voltage
  • Vehicle battery
  • ECU power source circuit
Yes DTC 6-2 LOW VEHICLE BATTERY VOLTAGE 
6-3  Backup Battery has been used
  • No problem
Not applicable DTC 6-3 BACKUP BATTERY HAS BEEN USED 
6-4  Backup Battery Connection Error
  • Mayday ECU assembly
  • Mayday battery (backup battery)
  • Wire harness
Yes DTC 6-4 BACKUP BATTERY CONNECTION ERROR