LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 2014 >> Express 1500 LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U1826: Lost Communication With Multi-Axis Acceleration Sensor Module >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the yaw/lat sensor.
  2. Ignition OFF for 60 seconds, test for less than 5 ohm between the low reference circuit terminal 6 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
  4. Ignition OFF, disconnect the harness connector at the EBCM.
  5. Ignition ON, test for less than 1 volt between the following terminal listed below and ground at the EBCM harness connector.
    • CAN bus high serial data circuit terminal 33
    • CAN bus low serial data circuit terminal 21
    • If greater than the specified value, test the appropriate serial data circuit for a short to voltage.
  6. Ignition OFF, test for infinite resistance between the following terminal listed below and ground at the EBCM harness connector.
    • CAN bus high serial data circuit terminal 33
    • CAN bus low serial data circuit terminal 21
    • If not the specified value, test the appropriate serial data circuit for a short to ground.
  7. Test for less than 2 ohms between the following terminals listed below.
    • CAN bus high serial data circuit terminal 33 at the EBCM harness connector and terminal 2 at the yaw/rate sensor.
    • CAN bus low serial data circuit terminal 21 at the EBCM harness connector and terminal 3 at the yaw/rate sensor.
    • If greater than the specified range, test the appropriate serial data circuit for an open/high resistance.
  8. Test for infinite resistance between the CAN bus high serial data circuit terminal 33 and the CAN bus low serial data circuit terminal 21 at the EBCM harness connector.
    • If not the specified value, test the serial data circuits for a short to each other.
  9. If all circuits test normal, replace the vehicle yaw sensor with vehicle lateral accelerometer.
scientia non olet · About LEMON Manuals