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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 52 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC B3794 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections .

DTC B3794

Step Action Values Yes No
Schematic Reference: Cruise Control Schematics 
Connector End View Reference: Master Electrical Component List
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With the scan tool, observe the Cruise Control Switch parameter in the Body and Accessories body control module (BCM) Data list.
Does the Cruise Control Switch parameter display Error?		 - Go to Step 3  Go to Step 4 
3
  1. Turn OFF the ignition.
  2. Disconnect C1 of the multifunction switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With the scan tool, observe the Cruise Control Switch parameter in the Body and Accessories BCM Data list.
Does the Cruise Control Switch parameter display Error?		 - Go to Step 9  Go to Step 11 
4
  1. Turn the cruise control On/Off control switch ON.
  2. With the scan tool, observe the Cruise Control Switch parameter in the Body and Accessories BCM Data list.
Does the Cruise Control Switch parameter display Error?		 - Go to Step 7  Go to Step 5 
5
  1. Activate the cruise control set/coast switch.
  2. With the scan tool, observe the Cruise Control Switch parameter in the Body and Accessories BCM Data list.
Does the Cruise Control Switch parameter display Error?		 - Go to Step 7  Go to Step 6 
6
  1. Activate the cruise control resume/accel switch.
  2. With the scan tool, observe the Cruise Control Switch parameter in the Body and Accessories BCM Data list.
Does the Cruise Control Switch parameter display Error?		 - Go to Step 7  Go to Diagnostic Aids
7
IMPORTANT: The cruise control on/off switch must be turned ON in order to correctly view the set/coast switch resistance values with the DMM.
  1. Turn OFF the ignition.
  2. With a DMM, measure the resistance of the cruise control switch between the ignition 1 voltage circuit and the cruise control set/coast and resume/accelerate switch signal circuit.
  3. Individually activate and hold the cruise control function switches while measuring the resistance value of each cruise control function switch.
Do the cruise control function switch resistance values measure between the specified values?		 Off = O.L.
On = 7.8 K-8.6 K
Resume = 2.7 K-3.0 K
Set = 1.2 K-1.3 K		 Go to Step 8  Go to Step 11 
8 Test the ignition 1 voltage circuit for a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 10 
9 Test the cruise control set/coast and resume/accel switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
10 Test the cruise control set/coast and resume/accel switch signal circuit for a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you complete the repair?		 - Go to Step 15  Go to Step 12 
11 Inspect for poor connections at C1 of the multifunction switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 13 
12 Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
13 Replace the cruise control switch. Refer to Turn Signal Multifunction Switch Replacement .
Did you complete the replacement?		 - Go to Step 15  -
14 Replace the BCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 15  -
15
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 - Go to Step 2  System OK
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