What Does B1470 Mean?
B1470 indicates the Body Control Module (BCM) has detected an abnormal voltage or signal condition in the headlamp input circuit. This code means the BCM is not receiving the proper input signal from the headlamp switch, multifunction switch, or associated wiring that commands the headlamps to operate. The fault is specifically in the input side of the circuit, meaning the command signal to turn on the headlamps is compromised.
Common Causes
35%
Faulty headlamp switch or multifunction switch with degraded contacts or internal failure
30%
Open, short to ground, or short to power in headlamp input circuit wiring or connectors
20%
Corroded or damaged BCM connector pins causing poor contact in headlamp input circuit
15%
Failed Body Control Module with internal circuit damage on headlamp input channel
Diagnostic Steps
1
Step 1: Perform visual inspection of headlamp switch, multifunction switch, and all associated connectors for physical damage, corrosion, or loose connections. Check for signs of water intrusion or burnt terminals.
2
Step 2: Using a digital multimeter, backprobe the headlamp switch connector and verify voltage and ground supply to the switch. Typical reading should be battery voltage (12-14V) on power supply pin and continuity to ground.
3
Step 3: Test headlamp switch operation by measuring resistance or voltage output at the switch connector while cycling the headlamp switch through all positions. Compare readings to manufacturer specifications (typically 0-5V signal or specific resistance values).
4
Step 4: Disconnect BCM connector and inspect for corrosion, bent pins, or damaged terminals. Measure continuity from headlamp switch output pin to corresponding BCM input pin with all connectors disconnected. Resistance should be less than 5 ohms.
5
Step 5: Check for short to ground or short to power by measuring resistance from the headlamp input circuit wire to ground and to battery voltage with switch and BCM disconnected. Readings should show infinite resistance (open circuit).
6
Step 6: If all wiring and switch tests pass, substitute or test BCM functionality with a known-good unit or perform BCM relearn/initialization procedure after repairs, then clear codes and verify headlamp operation in all modes.
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
B1470 indicates the Body Control Module (BCM) has detected an abnormal voltage or signal condition in the headlamp input circuit. This code means the BCM is not receiving the proper input signal from the headlamp switch, multifunction switch, or associated wiring that commands the headlamps to opera...
The most common cause of B1470 (Lamp Headlamp Input Circuit Failure) is: Faulty headlamp switch or multifunction switch with degraded contacts or internal failure
Typical repair costs for B1470 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Operating a vehicle without functional headlamps is illegal and extremely dangerous, especially in low-light conditions or at night. This code should be addressed immediately before driving in conditions requiring headlamps, as it creates a significant safety hazard to the driver and other road users.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1470 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System / Exterior Lighting
Difficulty
Type
Manufacturer
Recommended Tools
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