What Does B1520 Mean?
This code indicates the Body Control Module (BCM) has detected a malfunction in the Driver Information Center (DIC) switch circuit. The DIC switches allow the driver to navigate through vehicle information displays, trip computer functions, and various settings on the instrument cluster. The BCM has identified an open circuit, short circuit, or improper voltage signal from one or more of the DIC control buttons.
Common Causes
45%
Faulty DIC switch assembly or individual button contacts worn/stuck
30%
Damaged or corroded wiring harness between DIC switch and BCM
15%
Loose or corroded electrical connector at DIC switch or BCM
10%
Failed Body Control Module (BCM) internal circuit
Diagnostic Steps
1
Step 1: Perform a visual inspection of the DIC switch assembly for physical damage, stuck buttons, or signs of liquid intrusion. Press each button individually and verify tactile response and function on the display.
2
Step 2: Using a digital multimeter, check for battery voltage (typically 12V) at the DIC switch connector power supply pin with ignition on. Verify ground circuit has less than 0.1V resistance to chassis ground.
3
Step 3: Disconnect the DIC switch connector and measure resistance across each button terminal while pressing buttons (should show low resistance when pressed, high/infinite when released). Compare readings to manufacturer specifications if available.
4
Step 4: Inspect wiring harness from DIC switch to BCM for chafing, pinching, or damage, particularly at routing points near steering column and firewall. Check all connectors for corrosion, pushed-back pins, or moisture intrusion.
5
Step 5: If all wiring and switch tests pass, perform a resistance test between the DIC switch connector pins and corresponding BCM connector pins to verify circuit continuity (should be less than 5 ohms).
6
Step 6: After repairs, clear codes and perform functional test of all DIC buttons through multiple menus. Road test vehicle and verify code does not return and all display functions operate normally.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a malfunction in the Driver Information Center (DIC) switch circuit. The DIC switches allow the driver to navigate through vehicle information displays, trip computer functions, and various settings on the instrument cluster. The BCM has...
The most common cause of B1520 (Driver Information Center (DIC) Switch Circuit) is: Faulty DIC switch assembly or individual button contacts worn/stuck
Typical repair costs for B1520 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this does not affect vehicle operation or critical safety systems. The primary inconvenience is inability to access trip computer, settings, or information displays through the DIC controls, which is not a safety concern but should be repaired for full vehicle functionality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1520 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System
Difficulty
Type
Manufacturer
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