Circuit/System Testing

Test 1

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the appropriate electrical connector:
   • A23D Door Latch Assembly - Driver
   • A23LR Door Latch Assembly - Left Rear
   • A23P Door Latch Assembly - Passenger
   • A23RR Door Latch Assembly - Right Rear
3. Connect a test lamp between the test points:
   • A23D Door Latch Assembly - Driver:Control circuit terminal 6 & Control circuit terminal 8
   • A23P Door Latch Assembly - Passenger:Control circuit terminal 10 & Control circuit terminal 8
   • A23LR Door Latch Assembly - Left Rear:Control circuit terminal 6 & Control circuit terminal 8
   • A23RR Door Latch Assembly - Right Rear:Control circuit terminal 10 & Control circuit terminal 8
4. Ignition - On / Vehicle - In Service Mode
5. Perform the scan tool control function:Door Dead Lock Lock/Unlock - Lock & Unlock

   Verify the test lamp does not turn On and Off.

   • If the test lamp turns On and Off 

     Test or replace the component:A23 Door Latch Assembly

   • Go to next step: If the test lamp does not turn On and Off 
6. Ignition/Vehicle - Off
7. Disconnect the electrical connector:X6@K9 Body Control Module
8. Disconnect the electrical connector:X3@X53A Fuse Block - Rear Body
9. Test for less than 2 ohms between the test points:
   • Control circuit terminal 8@A23D Door Latch Assembly - Driver & Control circuit terminal 4 X6@Control module harness
   • Control circuit terminal 8@A23LR Door Latch Assembly - Left Rear & Control circuit terminal 4 X6@Control module harness
   • Control circuit terminal 8@A23P Door Latch Assembly - Passenger & Control circuit terminal 4 X6@Control module harness
   • Control circuit terminal 8@A23RR Door Latch Assembly - Right Rear & Control circuit terminal 4 X6@Control module harness
   • Control circuit terminal 10@A23P Door Latch Assembly - Passenger & Control circuit terminal 17 X3@Fuse Block Harness
   • Control circuit terminal 10@A23RR Door Latch Assembly - Right Rear & Control circuit terminal 17 X3@Fuse Block Harness
   • Control circuit terminal 6@A23D Door Latch Assembly - Driver & Control circuit terminal 17 X3@Fuse Block Harness
   • Control circuit terminal 6@A23LR Door Latch Assembly - Left Rear & Control circuit terminal 17 X3@Fuse Block Harness
   • If 2 ohms or greater 

     Repair the open/high resistance in the circuit.

   • Go to next step: If less than 2 ohms 
10. Test or replace the component:K9 Body Control Module

Test 2

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector:X2@X53A Fuse Block - Rear Body
3. Test for less than 10 ohms between the test points:Ground circuit terminal 27 & Ground
   • If 10 ohms or greater 
   1. Ground Connection - Disconnect
   2. Test for less than 2 ohms between the test points:Ground circuit terminal 27 & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
   • Go to next step: If less than 10 ohms 
4. Connect the electrical connector:X2@X53A Fuse Block - Rear Body
5. Disconnect the electrical connector:X7@K9 Body Control Module
6. Ignition - On / Vehicle - In Service Mode
7. Momentarily connect a 3 A fused jumper wire between the test points:Control circuit terminal 10 & B+

   Verify the component produces a clicking sound:A23D Door Latch Assembly - Driver

   • If the component does not produce a sound 
   1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
   2. Disconnect the electrical connector:X2@X53A Fuse Block - Rear Body
   3. Ignition - On / Vehicle - In Service Mode
   4. Test for less than 1 V between the test points:Control circuit terminal 10@Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
   5. Ignition/Vehicle - Off
   6. Test for infinite resistance between the test points:Control circuit terminal 10@Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   7. Test for less than 2 ohms between the test points:Control circuit terminal 10@Control module harness & Control circuit terminal 32 X2@Fuse Block Harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Test or replace the component:X53A Fuse Block - Rear Body
   • Go to next step: If the component turns On and Off 
8. Replace the component:K9 Body Control Module