2021 Honda Insight EXFACTORY OEM SERVICE PROCEDURE

Relay Control Module Connector for Inputs and Outputs

Connector Index
Relay Control Module Connector A (6P)
Relay Control Module Connector B (10P)
Relay Control Module Connector C (18P)

Relay Control Module Connector A (6P) (female terminals) 

GHH384295Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description Signal
1 +B BACK UP Power source for relay control module About battery voltage at all times
2 B-CAN_H Communication line ---
3 B-CAN_L Communication line ---
4 IG1 METER IG1 power source With the vehicle in the ON or START mode: about battery voltage
5 HOOD SW Detects HOOD SW signal With hood latch switch ON: less than 0.2 V
With hood latch switch OFF and wakeup mode: about battery voltage
With hood latch switch OFF and sleep mode: pulse
6 GND Ground for relay control module Less than 0.2 V at all times

Relay Control Module Connector B (10P) (female terminals) 

GHH384296Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description Signal
1 ILLUMI+ Outputs ILLUMI+ signal With combination light switch SMALL or ON: about battery voltage
With combination light switch OFF: less than 0.2 V
2 INTR LT CUT RLY OUT Outputs INTR LT CUT RLY OUT signal With interior lights are ON: about battery voltage
With interior lights are OFF: less than 0.2 V
3 DRL MODE R Outputs DRL MODE R signal With right daytime running lights are ON: about battery voltage
With right daytime running lights are OFF: less than 0.2 V
4 +B R/MOD 2 Power source for relay control module About battery voltage at all times
5 L H/L HI Outputs L H/L HI signal With left headlight (high) ON: about battery voltage
With left headlight (high) OFF: less than 0.2 V
6 Not used --- ---
7 RR DEF RLY CL- Outputs RR DEF RLY CL- signal With the vehicle in the ON mode and rear window defogger ON: less than 0.2 V
With the vehicle in the ON mode and rear window defogger OFF: about battery voltage
8 L H/L LO Outputs L H/L LO signal With left headlight (low) ON: about battery voltage
With left headlight (low) OFF: less than 0.2 V
9 H/L LO SIG Communication line ---
10 SMALL R Outputs SMALL R signal With right position lights are ON: about battery voltage
With right position lights are OFF: less than 0.2 V

Relay Control Module Connector C (18P) (female terminals) 

GHH384297Courtesy of HONDA, U.S.A., INC.
Terminal number Terminal name Description Signal
1 SMALL L Outputs SMALL L signal With left position lights are ON: about battery voltage
With left position lights are OFF: less than 0.2 V
2 Not used --- ---
3 R H/L HI Outputs R H/L HI signal With right headlight (high) ON: about battery voltage
With right headlight (high) OFF: less than 0.2 V
4 FR FOG LT RLY CL- Outputs FR FOG LT RLY CL- signal With front fog light switch ON: less than 0.2 V
With front fog light switch OFF: about battery voltage
5 +B BACK UP Power source for relay control module About battery voltage at all times
6 HORN SW Detects HORN SW signal With horn switch ON: less than 0.2 V
With horn switch OFF: about battery voltage
7 INTR LT CUT RLY OUT Outputs INTR LT CUT RLY OUT signal With interior lights are ON: about battery voltage
With interior lights are OFF: less than 0.2 V
8 DRL MODE L Outputs DRL MODE L signal With left daytime running lights are ON: about battery voltage
With left daytime running lights are OFF: less than 0.2 V
9 FR WASHER MTR Drives windshield washer motor With windshield washer switch ON: about battery voltage
With windshield washer switch OFF: less than 0.2 V
10 H/L ON SW Detects H/L ON SW signal With combination light switch ON: less than 0.2 V
With combination light switch OFF and wake-up mode: about battery voltage
With combination light switch OFF and sleep mode: pulse
Terminal number Terminal name Description Signal
11 R H/L LO Outputs R H/L LO signal With right headlight (low) ON: about battery voltage
With right headlight (low) OFF: less than 0.2 V
12 Not used --- ---
13 Not used --- ---
14 SCTY HORN RLY CL- Outputs SCTY HORN RLY CL- signal With security horn and horn sound: less than 0.2 V
With security horn and horn no sound: about battery voltage
15 GND Ground for relay control module Less than 0.2 V at all times
16 GND Ground for relay control module Less than 0.2 V at all times
17 RR WASHER MTR Drives rear window washer motor With rear window washer switch ON: about battery voltage
With rear window washer switch OFF: less than 0.2 V
18 +B WASHER Power source for relay control module About battery voltage at all times
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.