2010 Cadillac Truck SRX AWD V6-3.0L Page 354
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, test or replace the X50A
Fuse Block - Underhood.
3. Connect a test lamp between the control circuit terminal 85 and ground.
4. Ignition ON, command the rear washer relay ON and OFF using the wiper switch. The test lamp should turn ON and OFF when changing
between the commanded states.
瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control
Module.
瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or
replace the K9 Body Control Module.
5. If all circuits test normal, test or replace the KR7 Rear Wiper Relay.
Component Testing
Relay Test
1. Ignition OFF, connect the KR7 Rear Window Wiper Relay.
2. Test for 60-200 ohm between terminals 85 and 86.
瀚慖f the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
瀚慖f not the specified value, replace the relay.
4. Test for less than 5 ohm between terminals 30 and 87A.
瀚慖f greater than the specified range, replace the relay.
5. Install a 10 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for
less than 5 ohm between terminals 30 and 87.
瀚慖f greater than the specified range, replace the KR7 Rear Window Wiper Relay.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay
Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power
Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))
* Rear Window Wiper Motor Replacement (See: Wiper and Washer Systems/Wiper Motor/Service and Repair/Rear Window Wiper Motor
Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, programming and setup
B388A
DTC B388A
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions)provides an overview of each diagnostic category.
DTC Descriptor
DTC B388A 01
- Trailer Park Lamps Circuit Short to Battery
