What Does B1754 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the hazard flasher output control circuit. The BCM sends power or ground signals to activate the hazard flashers, but is receiving no feedback or detecting infinite resistance in the circuit. This prevents the hazard warning lights from functioning properly when the hazard switch is activated.
Common Causes
35%
Open or damaged wiring between BCM and hazard flasher relay or multifunction switch, including corroded connectors or broken wires in harness
30%
Failed hazard flasher relay or integrated flasher module within the BCM
20%
Faulty multifunction switch or hazard switch assembly with internal open circuit
10%
Failed Body Control Module with internal driver circuit failure
5%
Blown fuse or fusible link in hazard flasher circuit power supply
Diagnostic Steps
1
Step 1: Inspect all fuses related to hazard flasher circuit using test light or multimeter, verify fuse integrity and check for 12V power on both sides of fuse with ignition on
2
Step 2: Locate BCM connector and backprobe the hazard flasher output circuit wire (reference wiring diagram), use multimeter to check for voltage or continuity while activating hazard switch, should see switching voltage (0-12V)
3
Step 3: Disconnect hazard flasher relay or multifunction switch connector and perform continuity test from BCM output pin through harness to relay/switch connector, should read less than 5 ohms, check for opens or high resistance
4
Step 4: With harness disconnected, test hazard switch operation by checking continuity through switch terminals while cycling switch on/off, verify switch closes circuit when activated
5
Step 5: If wiring and switch test good, substitute known-good hazard flasher relay if external type, or test BCM output driver by measuring resistance to ground at BCM connector (should be low resistance when activated)
6
Step 6: Clear codes, reconnect all components, activate hazard switch and verify all turn signal lamps flash, rescan for codes to confirm repair
Estimated Repair Cost
$75 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an open circuit in the hazard flasher output control circuit. The BCM sends power or ground signals to activate the hazard flashers, but is receiving no feedback or detecting infinite resistance in the circuit. This prevents the hazard w...
The most common cause of B1754 (Hazard Flash Output Circuit Open) is: Open or damaged wiring between BCM and hazard flasher relay or multifunction switch, including corroded connectors or broken wires in harness
Typical repair costs for B1754 range from $75 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle can be driven but hazard warning lights are non-functional, creating a safety risk during roadside emergencies or when signaling other drivers of stopped vehicle. Repair should be completed soon as hazard lights are legally required safety equipment in most jurisdictions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1754 to identify the root cause.
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Quick Info
Category
Body
System
Exterior Lighting System
Difficulty
Type
Manufacturer
Recommended Tools
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