INSPECTION PROCEDURE 1. INSPECT UNLOCK WARNING SWITCH ASSEMBLY 
(a) Measure the resistance according to the value(s) in the table below. Standard resistance:
If the result is not as specified, replace the unlock warning switch assembly. Text in Illustration
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Toyota Tundra Service Manual > Touch Select 2-4 And High-low System: Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM DTC Code Detection Item 4LO Indicator and 4HI Indicator See page P0560 System Voltage Not illuminated P17A0 Automatic Disconnecting Differential Motor Control Circuit Open Rapidly blinking P17A1 Automatic Disconnecting Differential M ...
