What Does B1624 Mean?
This code indicates that the Body Control Module (BCM) has detected an open circuit in the output circuit that powers the keypad illumination lamp. An open circuit means there is a break in the electrical pathway preventing current flow to the keypad lighting. The BCM monitors this circuit and sets this code when it cannot detect proper current draw or voltage feedback from the lamp circuit.
Common Causes
45%
Open circuit in wiring harness or connector between BCM and keypad lamp assembly due to broken wires, corroded terminals, or disconnected connector
30%
Failed keypad lamp bulb or LED assembly creating open circuit condition
15%
Faulty keypad assembly with internal circuit board failure or broken solder joints
10%
Failed BCM output driver circuit for lamp control
Diagnostic Steps
1
Step 1: Perform visual inspection of keypad assembly and associated wiring harness for obvious damage, loose connectors, corrosion, or broken wires. Check keypad connector for proper seating and terminal condition.
2
Step 2: Using a digital multimeter, backprobe the keypad lamp connector with ignition on and verify presence of battery voltage (typically 12-14V) on the power supply wire from BCM when keypad illumination should be active.
3
Step 3: Check continuity of the ground circuit from keypad lamp assembly back to chassis ground or BCM ground terminal using multimeter in ohms mode (should read less than 5 ohms resistance).
4
Step 4: If power and ground are present at connector, remove keypad assembly and test lamp bulb/LED directly with power and ground using jumper wires to confirm lamp operation. Replace lamp if faulty.
5
Step 5: If lamp tests good but circuit shows open, inspect wiring harness for internal breaks by performing continuity tests from BCM connector to keypad connector on both power and ground circuits with connectors disconnected.
6
Step 6: Clear codes and verify repair by commanding keypad lamp on through scan tool active tests (if available) or cycling ignition to activate illumination, then recheck for code reset.
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected an open circuit in the output circuit that powers the keypad illumination lamp. An open circuit means there is a break in the electrical pathway preventing current flow to the keypad lighting. The BCM monitors this circuit and sets ...
The most common cause of B1624 (Lamp Keypad Output Open Circuit) is: Open circuit in wiring harness or connector between BCM and keypad lamp assembly due to broken wires, corroded terminals, or disconnected connector
Typical repair costs for B1624 range from $75 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle safety or driveability and the vehicle is safe to operate. The only consequence is lack of keypad illumination, which may cause minor inconvenience when attempting to use the keypad in low-light conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1624 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System
Difficulty
Type
Manufacturer
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