What Does B1625 Mean?
This code indicates the Body Control Module (BCM) has detected an abnormal voltage condition on the keypad illumination lamp circuit. Specifically, the output circuit for the keypad lighting is shorted directly to battery voltage instead of being controlled by the BCM. This means current is flowing when it shouldn't be, bypassing normal control circuitry.
Common Causes
45%
Damaged wiring harness or chafed insulation causing wire-to-power short between BCM and keypad lamp assembly
30%
Failed keypad lamp assembly with internal short to power supply
15%
Corroded or damaged connector pins at keypad or BCM creating cross-circuit short
10%
Failed Body Control Module with shorted internal output driver transistor
Diagnostic Steps
1
Step 1: Perform visual inspection of keypad lamp assembly and all associated wiring from BCM to keypad, looking for chafed insulation, pinched wires, melted connectors, or signs of water intrusion. Check for any aftermarket accessories or recent work near this circuit.
2
Step 2: Disconnect the keypad lamp connector and use a digital multimeter to measure voltage at the BCM side of the connector with ignition on. If battery voltage is present with keypad disconnected, the short is in the wiring harness between BCM and keypad.
3
Step 3: With keypad still disconnected, measure resistance from the BCM lamp output wire to battery positive. Reading should be open circuit (OL or infinite). Any continuity indicates a short to power in the harness. Wiggle and flex harness while monitoring for intermittent shorts.
4
Step 4: If harness tests good, inspect keypad lamp assembly. Disconnect power, then measure resistance across lamp terminals. Check for any resistance path to vehicle ground or power that shouldn't exist. Compare readings to known-good specifications if available.
5
Step 5: If all external components test good, suspect BCM internal fault. Before replacing BCM, verify all fuses are correct amperage and check for signs of previous electrical overload. Clear codes and monitor if short reappears immediately or only under specific conditions.
6
Step 6: Repair identified fault (replace harness section, keypad assembly, or BCM as needed), clear codes, and verify proper keypad lamp operation through multiple on/off cycles and environmental conditions to confirm repair.
Estimated Repair Cost
$100 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an abnormal voltage condition on the keypad illumination lamp circuit. Specifically, the output circuit for the keypad lighting is shorted directly to battery voltage instead of being controlled by the BCM. This means current is flowing ...
The most common cause of B1625 (Lamp Keypad Output Short Circuit To Battery) is: Damaged wiring harness or chafed insulation causing wire-to-power short between BCM and keypad lamp assembly
Typical repair costs for B1625 range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this affects only keypad illumination. The short circuit may drain the battery or blow a fuse, and could potentially cause localized wiring harness heat if current draw is excessive. Repair within a few days to prevent potential electrical system damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1625 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Lighting System
Difficulty
Type
Manufacturer
Recommended Tools
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