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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 85 (Transfer Case - ISUZU T150) >> Diagnostic Information and Procedures >> Accessory Switch Transfer Case Mode Buttons Inoperative >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step tests the accessory switch for proper resistance values in all mode switch states.
Accessory Switch Transfer Case Mode Buttons Inoperative

Step Action Values Yes No
Schematic Reference: Transfer Case Control Schematics 
Connector End View Reference: Transfer Case Control Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. With the switch disconnected, connect a DMM between the accessory switch signal circuit and the 5 volt reference circuit at the switch.
  2. Measure the resistance through the accessory switch while pressing and holding each of the mode buttons and comparing values.
Does the DMM indicate all resistance values within the specified ranges?		 4 HI: 656.2-669.4 Ω
2 HI: 1.50-1.53 K Ω
Neutral: 1.010-1.031 K Ω
4 LO: 2.32-2.36 K Ω
Normal: 9.00-9.18 K Ω		 Go to Step 4  Go to Step 3 
3 Replace the accessory switch. Refer to Accessory Switch Replacement .
Did you complete the repair?		 - Go to Step 5  -
4 Replace the transfer case shift control module. Refer to Control Module References for replacement, setup, and programming.
Did you complete the repair?		 - Go to Step 5  -
5
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle to determine if the symptom has been corrected.
Is the symptom still present?		 - Go to Step 2  System OK
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