What Does B1753 Mean?
This code indicates the Body Control Module (BCM) has detected a fault in the hazard flasher output circuit. The BCM is unable to properly control or detect feedback from the hazard light relay or output driver circuit. This affects the vehicle's emergency hazard warning light system, preventing all four turn signals from flashing simultaneously when the hazard switch is activated.
Common Causes
35%
Faulty hazard flasher relay or integrated relay module within the BCM
30%
Open or short circuit in wiring between BCM and hazard flasher output
20%
Failed hazard switch with internal circuit fault affecting feedback signal
10%
Corroded or damaged connector terminals at BCM or relay location
5%
Internal BCM output driver transistor failure
Diagnostic Steps
1
Step 1: Perform visual inspection of hazard switch, flasher relay (if external), and BCM connectors for corrosion, burnt pins, or damaged terminals. Check all related fuses in the lighting/flasher circuit.
2
Step 2: Using a digital multimeter, test for battery voltage at the hazard flasher relay power supply terminal with ignition on. Verify ground circuit continuity at relay ground terminal (should read less than 0.5 ohms to chassis ground).
3
Step 3: Activate hazard switch and use multimeter to check for switching voltage at the BCM output pin for hazard control (consult wiring diagram for specific terminal). Should see 12V pulsing on/off when hazards are activated.
4
Step 4: If no output from BCM, backprobe the hazard switch connector to verify switch is sending proper input signal to BCM (typically 12V or ground signal when activated). Replace switch if no signal present.
5
Step 5: Test continuity of wiring between BCM output terminal and flasher relay input terminal with ignition off. Should read less than 1 ohm. Check for short to ground or power (infinite resistance when circuit isolated).
6
Step 6: If all wiring and components test good but code persists, suspect internal BCM failure. Replace BCM and perform module programming/initialization as required by manufacturer.
Estimated Repair Cost
$100 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a fault in the hazard flasher output circuit. The BCM is unable to properly control or detect feedback from the hazard light relay or output driver circuit. This affects the vehicle's emergency hazard warning light system, preventing all...
The most common cause of B1753 (Hazard Flash Output Circuit Failure) is: Faulty hazard flasher relay or integrated relay module within the BCM
Typical repair costs for B1753 range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is drivable but hazard lights may not function, which creates a significant safety risk during roadside emergencies or breakdowns. Repair should be completed promptly as hazard lights are legally required emergency 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 B1753 to identify the root cause.
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Quick Info
Category
Body
System
Exterior Lighting System (Hazard Warning Lights)
Difficulty
Type
Manufacturer
Recommended Tools
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