If the test lamp is always OFF
11.1Ignition OFF, disconnect the harness connector at the Assist Step Control Module.
11.2Test for less than 1 V between the control circuit and ground.
-If 1 V or greater, repair the short to voltage on the circuit.
鈬揑f less than 1 V
11.3Ignition OFF.
11.4Test for less than 2 锟?in the control circuit end to end.
-If 2 锟?or greater, repair the open/high resistance in the circuit.
-If less than 2 锟? replace the Assist Step Control Module.
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If the test lamp is always ON
11.1Ignition OFF, disconnect the harness connector at the Assist Step Control Module.
11.2Test for infinite resistance between the control circuit and ground.
-If less than infinite resistance, repair the short to ground on the circuit.
-If infinite resistance, replace the Assist Step Control Module.
锟?If the test lamp turns ON and OFF
12.Test or replace the appropriate assist step motor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Assist Step Motor Replacement
- Control Module References for Assist Step Control Module replacement, programming and setup.
B051B
DTC B051A, B051B, B051C, or B051D
Diagnostic Instructions
-Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
-Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B051A 0B:Left Side Assist Step Motor Control Circuit Current Above Threshold
DTC B051A 01:Left Side Assist Step Motor Control Circuit Short to Battery
DTC B051A 02:Left Side Assist Step Motor Control Circuit Short to Ground
DTC B051A 04:Left Side Assist Step Motor Control Circuit Open Circuit
DTC B051B 0B:Right Side Assist Step Motor Control Circuit Current Above Threshold
DTC B051B 01:Right Side Assist Step Motor Control Circuit Short to Battery
DTC B051B 02:Right Side Assist Step Motor Control Circuit Short to Ground
DTC B051B 04:Right Side Assist Step Motor Control Circuit Open Circuit
DTC B051C 01:10 V Reference Circuit Short to Battery
