2021 Honda Accord Sport, DEI Shock Sensor and Tilt Sensor, Factory Alarm

Hi Guys, looking for help to install a DEI shock sensor 504K and tilt sensor 507M on a 2001 Honda Accord Sport. Cannot locate wiring diagrams anywhere so I can tow in these sensors and related relays / fuses, etc.

The 21’ Accord I am working on has both a factory alarm and remote start.

12 Volts      Lt. Green (15A)      +      BCM behind dash fuse box, blue 66 pin plug (B), pin 1           
Second 12 Volts      Red (60A)      +      Dash fuse box, 27 pin plug (D), pin 3           
Ground      (chassis ground)                     
Starter      Violet      +      BCM behind dash fuse box, brown 66 pin plug (C), pin 51      Directwire      
Ignition      White      +      BCM behind dash fuse box, brown 66 pin plug (C), pin 54      Directwire      
Accessory      Gray      +      BCM behind dash fuse box, brown 66 pin plug (C), pin 43      Directwire      
Second Accessory      Pink      +      BCM behind dash fuse box, brown 66 pin plug (C), pin 58      Directwire      
Ignition Interrupt      Lt. Blue      Cut      BCM behind dash fuse box, brown 66 pin plug (C), pin 26           
Ignition Interrupt 2      Blue      Cut      BCM behind dash fuse box, brown 66 pin plug (C), pin 27           
Ignition Interrupt 3      Yellow      Cut      BCM behind dash fuse box, brown 66 pin plug (C), pin 28           
Ignition Interrupt 4      Red      Cut      BCM behind dash fuse box, white 66 pin plug (A), pin 2      Directwire      
Ignition Interrupt 5      Red (if equipped)      Cut      Steering Lock Module under steering column, gray 12 pin plug, pin 12           
PTS 1      Black      -      BCM behind dash fuse box, brown 66 pin plug (C), pin 5      Directwire      
CAN Bus High      White (F-CAN)      Data      BCM behind dash fuse box, white 66 pin plug (A), pin 64      Directwire      
CAN Bus Low      Red (F-CAN)      Data      BCM behind dash fuse box, white 66 pin plug (A), pin 63      Directwire      
CAN Bus High 2      Pink (B-CAN)      Data      BCM behind dash fuse box, white 66 pin plug (A), pin 54      Directwire      
CAN Bus Low 2      Blue (B-CAN)      Data      BCM behind dash fuse box, white 66 pin plug (A), pin 55      Directwire      
CAN Bus High 3      Pink (DIAG-CAN)      Data      OBD-Data Link Connector, gray 16 pin plug, pin 6           
CAN Bus Low 3      Blue (DIAG-CAN)      Data      OBD-Data Link Connector, gray 16 pin plug, pin 14           
OBD 12 Volts      Red (10A)      +      OBD-Data Link Connector, gray 16 pin plug, pin 16           
OBD Ground      Black      -      OBD-Data Link Connector, gray 16 pin plug, pin 4           
OBD Connector      Gray           Under Driver Dash, Near Driver Kick           
IMMO Data      Tan (S-NET)      Data      BCM behind dash fuse box, blue 66 pin plug (B), pin 54      Directwire      
Power Lock      (use factory alarm arm and lock detection)                     
Power Unlock      (use factory alarm disarm and unlock detection)                     
Power Lock2      Blue (if needed)      -      BCM behind dash fuse box, white 66 pin plug (A), pin 15      Directwire      
Power Unlock2      Yellow (passenger doors) (if needed)      -      BCM behind dash fuse box, white 66 pin plug (A), pin 32      Directwire      
Power Unlock - Driver Door      Green (if needed)      -      BCM behind dash fuse box, white 66 pin plug (A), pin 33      Directwire      
Lock Motor      Violet      Reverse      Dash Fuse Box, 22 pin plug (A), pin 12           
Driver Unlock Motor      Blue      Reverse      Driver Kick, door harness --or-- Dash Fuse Box, rear, 22 pin plug (K), pin 6           
Passenger Unlock Motor      Pink      Reverse      Dash Fuse Box, 22 pin plug (A), pin 14           
Factory Alarm Arm      Violet      -      Power Window Master Switch, 37 pin plug, pin 3           
Factory Alarm Disarm      Red      Double -      Power Window Master Switch, 37 pin plug, pin 4           
Lock Detection      Blue      -      Power Window Master Switch, 37 pin plug, pin 18           
Unlock Detection      Lt. Blue      Double -      Power Window Master Switch, 37 pin plug, pin 17           
Parking Lights      Lt. Blue (L); Violet (R)      +      Driver Kick, harness to rear           
Parking Lights -      Gray      -      BCM behind dash fuse box, white 66 pin plug (A), pin 12      Directwire      
Hazards      Green      -      BCM behind dash fuse box, blue 66 pin plug (B), pin 40      Directwire      
Turn Signal (Left)      Blue (LF); Yellow (LR)      +      BCM behind dash fuse box, blue 66 pin plug (B), pin 18 (LF); pin 16 (LR)      Directwire      
Turn Signal (Right)      Green (RF); Brown (RR)      +      BCM behind dash fuse box, blue 66 pin plug (B), pin 17 (RF); pin 15 (RR)      Directwire      
Headlight      Pink      -      BCM behind dash fuse box, white 66 pin plug (A), pin 7      Directwire      
AutoLights      Yellow      - (Off)      BCM behind dash fuse box, white 66 pin plug (A), pin 41      Directwire      
Reverse Light      White      +      Dash Fuse Box, 22 pin plug (A), pin 15           
Left Front Door Trigger      Green      -      BCM behind dash fuse box, blue 66 pin plug (B), pin 63      Directwire      
Right Front Door Trigger      Lt. Green      -      BCM behind dash fuse box, blue 66 pin plug (B), pin 47      Directwire      
Left Rear Door Trigger      Brown      -      BCM behind dash fuse box, blue 66 pin plug (B), pin 64      Directwire      
Right Rear Door Trigger      Gray      -      BCM behind dash fuse box, blue 66 pin plug (B), pin 48      Directwire      
Dome Light      White      -      BCM behind dash fuse box, white 66 pin plug (A), pin 50      Directwire      
Trunk/Hatch Pin      White      -      BCM behind dash fuse box, blue 66 pin plug (B), pin 65      Directwire      
Hood Pin      Brown      -      Hood Switch, 2 pin plug, pin 1           
Trunk/Hatch Release      Lt. Blue      -      BCM behind dash fuse box, white 66 pin plug (A), pin 18      Directwire

Thank you so much for these. I have installed the shock sensor and feel confident about my work and tested already. However the Tilt Sensor DEI 507M requires a "ground when armed" or GWA so that the sensor can function properly. I am confused honestly as to where I pull that ground. Logic thinking says that the sensor should receive the Ground only when armed and loose it whenever the alarm is not active. Very important because this also resets the sensor so it can learn the tilt every time. Can one of you pros tell me where this Ground when armed can be pulled from?

Thanks

Try connecting it to the ignition wire. It has 12 volts when key is on, and when the key is off I am pretty sure it has enough ground potential to trigger that wire. In the past people would want to install a fake flashing LED to make others think there was an alarm on the car, in that case you would connect the positive LED wire to constant power and the ground would connect to ignition, when you turn the key off the LED would flash.

If you want to check it to see if it is going to work, connect your red meter lead to a known good constant voltage, connect the black lead to the ignition wire mentioned in my earlier post. When the key is on it should read less than a volt, and when you turn the key off it should read close to 12 volts.

If you are not comfortable using ignition for ground while armed, you can use a relay. Ground to 85 and 30. Ignition to 86 87A is ground while armed output. Anytime the ignition is off, there will be ground on 87A.

Thank you again - much appreciated and you are correct. I did not feel comfortable having a hot 12v on that negative trigger so giving it some thought and considering I had an extra relay I had actually done what you suggested. Glad to report that tilt sensor is working perfectly as I can now toggle a direct panel ground via relay.

My headache at the moment is the shock sensor 504D - sensor works perfectly but the problem is when trying to use remote start - factory built in. In a nutshell what happens is as the car is remote started the shock sensor picks up the vibrations and triggers. I can get past this by turning down the sensitivity on sensor but to a point of making it useless. I have the sensor / relay wired up correctly where the 12v to the sensor is removed when the car is turned on but for the brief moment that car is turning on remotely the sensor is still receiving power and outputs killing the engine. The end scenario is you hear the engine trying to crank and immediately dies. I have the 12v ACC fuse taped and this is where I get my 12v going to relay coil which then should turn off the constant 12v going to the sensor. At a loss on this as the only remedy seems like I need a faster 12v when that engine is trying to crank.

BTW - my shock sensor trigger is going to the driver door - isolating diodes were used.
12v