LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2021 >> CX-9 Signature >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> On-Board Diagnostic - Auto Leveling Control Module >> DTC B1D01-13: Headlight (RH) Circuit Malfunction [Auto Leveling Control Module] >> Diagnostic Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedure

STEP INSPECTION ACTION
1 INSPECT FRONT COMBINATION LIGHT (RH) CONNECTOR CONDITION
  • Switch the ignition off.
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Disconnect the front combination light (RH) connector.
  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
  • Is the connector normal?
 Yes Go to the next step.
No Repair or replace the connector, then go to Step 6.
2 INSPECT AUTO LEVELING CONTROL MODULE CONNECTOR CONDITION
  • Disconnect the auto leveling control module connector.
  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
  • Is the connector normal?
 Yes Go to the next step.
No Repair or replace the connector, then go to Step 6.
3 INSPECT HEADLIGHT (RH) MALFUNCTION DETECTION CIRCUIT FOR SHORT TO GROUND
  • Verify that the front combination light (RH) and auto leveling control module connectors are disconnected.
  • Inspect for continuity between front combination light (RH) terminal N (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Refer to appropriate wiring diagram and verify whether or not there is a common connector between auto leveling control module terminal H and front combination light (RH) terminal N.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
  • Repair or replace the malfunctioning part.

If there is no common connector:
  • Repair or replace the wiring harness which has a short to ground.

Go to Step 6.
No Go to the next step.
4 INSPECT HEADLIGHT (RH) MALFUNCTION DETECTION CIRCUIT FOR OPEN CIRCUIT
  • Verify that the front combination light (RH) and auto leveling control module connectors are disconnected.
  • Inspect the wiring harness for continuity between auto leveling control module terminal H (wiring harness-side) and front combination light (RH) terminal N (wiring harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Refer to appropriate wiring diagram and verify whether or not there is a common connector between auto leveling control module terminal H and front combination light (RH) terminal N.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
  • Repair or replace the malfunctioning part.

If there is no common connector:
  • Repair or replace the wiring harness which has an open circuit.

Go to Step 6.
5 VERIFY IF MALFUNCTIONING LOCATION IS FRONT COMBINATION LIGHT (RH) DEPENDING ON REPEATABILITY Yes Replace the front combination light (RH), then go to the next step.
(See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION .)
No Go to Step 7.
6 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
7 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
 Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [AUTO LEVELING CONTROL MODULE] .)
No DTC troubleshooting completed.
scientia non olet · About LEMON Manuals